function add_validation(itemname,descriptor,errstr)
{
  if(!this.formobj)
	{
		alert("BUG: the form object is not set properly");
		return;
	}//if
	var itemobj = this.formobj[itemname];
	if(!itemobj)
	{
		alert("BUG: Couldnot get the input object named: "+itemname);
		return;
	}
	if(!itemobj.validationset)
	{
		itemobj.validationset = new ValidationSet(itemobj);
	}
	itemobj.validationset.add(descriptor,errstr);
	return itemobj.validationset.validate();

}
function Validator(frmname)
{
	this.formobj=document.forms[frmname];
	if(!this.formobj)
	{
		alert("BUG: couldnot get Form object "+frmname);
		return;
	}
	if(this.formobj.onsubmit)
	{
		this.formobj.old_onsubmit = this.formobj.onsubmit;
		this.formobj.onsubmit=null;
	}
	else
	{
		this.formobj.old_onsubmit = null;
	}
	this.formobj.onsubmit=form_submit_handler;
	this.addValidation = add_validation;
	this.setAddnlValidationFunction=set_addnl_vfunction;
	this.clearAllValidations = clear_all_validations;
}
function set_addnl_vfunction(functionname)
{
	this.formobj.addnlvalidation = functionname;
}
function clear_all_validations()
{
	for(var itr=0;itr < this.formobj.elements.length;itr++)
	{
		this.formobj.elements[itr].validationset = null;
	}
}
function form_submit_handler()
{
	for(var itr=0;itr < this.elements.length;itr++)
	{
		if(this.elements[itr].validationset &&
	   !this.elements[itr].validationset.validate())
		{
		  return false;
		}
	}
	if(this.addnlvalidation)
	{
	  str =" var ret = "+this.addnlvalidation+"()";
	  eval(str);
    if(!ret) return ret;
	}
	return true;
}

function ValidationDesc(inputitem,desc,error)
{
	this.desc=desc;
	this.error=error;
	this.itemobj = inputitem;
	this.validate=vdesc_validate;
}
function vdesc_validate()
{
 if(!V2validateData(this.desc,this.itemobj,this.error))
 {
	 if(this.itemobj.readonly==false || this.itemobj.disabled==false)
	 {
	    this.itemobj.focus();
	 }
	 return false;	 
 }
 return true;
}
function ValidationSet(inputitem)
{
    this.vSet=new Array();
	this.add= add_validationdesc;
	this.validate= vset_validate;
	this.itemobj = inputitem;
}
function add_validationdesc(desc,error)
{
  this.vSet[this.vSet.length]= 
	  new ValidationDesc(this.itemobj,desc,error);
}
function vset_validate()
{
   for(var itr=0;itr<this.vSet.length;itr++)
	 {
	   if(!this.vSet[itr].validate())
		 {
		   return false;
		 }
	 }
	 return true;
}
function validateEmailv2(email)
{
// a very simple email validation checking. 
// you can add more complex email checking if it helps 
    var splitted = email.match("^(.+)@(.+)$");	
    if(splitted == null) return false;
    if(splitted[1] != null )
    {
      var regexp_user=/^\"?[\w-_\.]*\"?$/;
      if(splitted[1].match(regexp_user) == null) return false;
    }
    if(splitted[2] != null)
    {
      var regexp_domain=/^[\w-\.]*\.[A-Za-z]{2,4}$/;
      if(splitted[2].match(regexp_domain) == null) 
      {
	    var regexp_ip =/^\[\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\]$/;
	    if(splitted[2].match(regexp_ip) == null) return false;
      }// if
      return true;
    }
return false;
}


//Past Date Validation

function PastDate(field)
{	
	var anum = field.value;
	var dt = new Date();
	dt1 = (dt.getMonth()+1)+"-"+dt.getDate()+"-"+dt.getYear();
	if (anum!="")
	{	
		if (Date.parse(anum) < Date.parse(dt1))
			return false;
	}
	return true;
}


//Future Date Validation

function FutureDate(field)
{	
	var anum = field.value;
	var dt = new Date();
	dt1 = (dt.getMonth()+1)+"-"+dt.getDate()+"-"+dt.getYear();
	if (anum!="")
	{	
		if (Date.parse(anum) > Date.parse(dt1))
			return false;
	}
	return true;
	
}


//Today Date Validation

function TodayDate(field)
{	
	var anum = field.value;
	var dt = new Date();
	dt1 = (dt.getMonth()+1)+"-"+dt.getDate()+"-"+dt.getYear();
	if (anum!="")
	{
		if (Date.parse(anum) == Date.parse(dt1))
		return false;
	}
	return true;
}


// Flaot Validation

function ValidFloat(field)
{
	var anum = field.value;
	var Count = 0;
	numstr = "0123456789."
    for(var i=0;i<anum.length;i++){
    if(numstr.indexOf(anum.charAt(i)) == -1)
    {	
	return false;
    }
    if(anum.charAt(i) == ".")
      {
	Count = Count + 1;
	if(Count > 1)
	{
	return false;
	}
      }

    if(anum.charAt(0) == "." && anum.length==1)
      { 
	return false; 
      }
	
    }
	if (parseInt(field.value) > 2147483647 )
	{
	alert(strError+": Exceed the Max value."); 
	return false; 
	}
    return true;
}



function V2validateData(strValidateStr,objValue,strError) 
{ 
    var epos = strValidateStr.search("="); 
    var  command  = ""; 
    var  cmdvalue = ""; 
    if(epos >= 0) 
    { 
     command  = strValidateStr.substring(0,epos); 
     cmdvalue = strValidateStr.substr(epos+1); 
    } 
    else 
    { 
     command = strValidateStr; 
    } 
    switch(command) 
    { 
        case "req": 
        case "required": 
         { 
           if(eval(objValue.value.length) == 0) 
           { 
              if(!strError || strError.length !=0) 
              { 
                strError = strError+ " : is required field"; 
              }//if 
              alert(strError); 
              return false; 
           }//if 
           break;             
         }//case required 
        case "maxlength": 
        case "maxlen": 
          { 
             if(eval(objValue.value.length) >  eval(cmdvalue)) 
             { 
               if(!strError || strError.length !=0) 
               { 
                 strError = strError + " : "+cmdvalue+" characters maximum "; 
               }//if 
               alert(strError + "\n[Current length = " + objValue.value.length + " ]"); 
               return false; 
             }//if 
             break; 
          }//case maxlen 
        case "minlength": 
        case "minlen": 
           { 
             if(eval(objValue.value.length) <  eval(cmdvalue)) 
             { 
               if(!strError || strError.length !=0) 
               { 
                 strError = strError + " : " + cmdvalue + " characters minimum  "; 
               }//if               
               alert(strError + "\n[Current length = " + objValue.value.length + " ]"); 
               return false;                 
             }//if 
             break; 
            }//case minlen 
        case "alnum": 
        case "alphanumeric": 
           {
              var charpos = objValue.value.search("[^A-Za-z0-9\ ]"); 
			  if (objValue.value.charAt(0) == " ")
			  {
				  alert("Enter Proper Value");
				  return false;
			  }
              if(objValue.value.length > 0 &&  charpos >= 0) 
              { 
               if(!strError || strError.length !=0) 
                { 
                  strError = strError+": Alphanumeric and Spaces are allowed "; 
                }//if 
                alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
                return false; 
              }//if 
              break; 
           }//case alphanumeric 

	   case "alnumcode": 
           {
              var charpos = objValue.value.search("[^A-Za-z0-9\-._\/ ]"); 
			  if (objValue.value.charAt(0) == " ")
			  {
				  alert("Enter Proper Value");
				  return false;
			  }
              if(objValue.value.length > 0 &&  charpos >= 0) 
              { 
               if(!strError || strError.length !=0) 
                { 
                  strError = strError+": Alphanumeric and  - _ . / are allowed "; 
                }//if 
				//alert(strError);
                alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
                return false; 
              }//if 
              break; 
           }//case alphanumeric 

	   case "alnumdesc": 
           {
              var charpos = objValue.value.search("[^A-Za-z0-9\-~!:@#$%&*()_+={}<>,.?\[\\]\/\\\\ ]"); 
			  if (objValue.value.charAt(0) == " ")
			  {
				  alert("Enter Proper Value");
				  return false;
			  }
              if(objValue.value.length > 0 &&  charpos >= 0) 
              { 
               if(!strError || strError.length !=0) 
                { 
                  strError = strError+": Alphanumeric and  - _ . /  are allowed "; 
                }//if 
                alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
                return false; 
              }//if 
              break; 
           }//case alphanumeric with all pritable Characters "-", "_", ".", "/" 

	   case "alnumname":
	   case "city":
           {
              var charpos = objValue.value.search("[^A-Za-z0-9\-_.'\ ]"); 
			  if (objValue.value.charAt(0) == " ")
			  {
				  alert("Enter Proper Value");
				  return false;
			  }
              if(objValue.value.length > 0 &&  charpos >= 0) 
              { 
               if(!strError || strError.length !=0) 
                { 
                  strError = strError+": Alphanumeric and - _ . / are allowed "; 
                }//if 
                alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
                return false; 
              }//if 
              break; 
           }//case alphanumeric with - and spaces

		case "num": 
        case "numeric": 
           { 
              var charpos = objValue.value.search("[^0-9]"); 
              if(objValue.value.length > 0 &&  charpos >= 0) 
              { 
                if(!strError || strError.length !=0) 
                { 
                  strError = strError+": Only digits allowed "; 
                }//if               
                alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
                return false; 
              }//if 
			if (parseInt(objValue.value) > 2147483647 )
			{
				alert(strError+": Exceed the Max value."); 
				return false; 
			}
              break;               
           }//numeric 
        case "alphabetic": 
        case "alpha": 
           { 
              var charpos = objValue.value.search("[^A-Za-z\ ]"); 
              if(objValue.value.length > 0 &&  charpos >= 0) 
              { 
                  if(!strError || strError.length !=0) 
                { 
                  strError = strError+": Only alphabetic characters allowed "; 
                }//if                             
                alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
                return false; 
              }//if 
              break; 
           }//alpha 

		case "alnumhyphen":
			{
              var charpos = objValue.value.search("[^A-Za-z0-9\ -_]"); 
              if(objValue.value.length > 0 &&  charpos >= 0) 
              { 
                  if(!strError || strError.length !=0) 
                { 
                  strError = strError+": characters allowed are A-Z,a-z,0-9,- and _"; 
                }//if                             
                alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
                return false; 
              }//if 			
			break;
			}

		case "phno":
		{
			 var charpos = objValue.value.search("[^0-9\-()\ ]"); 
              if(objValue.value.length > 0 &&  charpos >= 0) 
              { 
                  if(!strError || strError.length !=0) 
                { 
                  strError = strError+": characters allowed are 0-9, and ()"; 
                }//if                             
                alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
                return false; 
              }//if 			
			break;

		}

		case "address":
		{
			var charpos = objValue.value.search("[^A-Za-z0-9\-~!?@#$%&*()_+={}<>,.?\[\\]\/\\\\ ]"); 
              if(objValue.value.length > 0 &&  charpos >= 0) 
              { 
                  if(!strError || strError.length !=0) 
                { 
                  strError = strError+": characters allowed are A-Z,a-z,0-9,-,_,*,#,/,&,(,),.,and,"; 
                }//if                             
                alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
                return false; 
              }//if 			
			break;
		}

        case "email": 
          { 
               if(!validateEmailv2(objValue.value)) 
               { 
                 if(!strError || strError.length !=0) 
                 { 
                    strError = strError+": allows only valid Email address ";  
                 }//if                                               
                 alert(strError); 
                 return false; 
               }//if 
           break; 
          }//case email 

	case "float":
            {
 		if(!ValidFloat(objValue))
		  {
		    alert(strError+" : allows only Decimal and numeric values");
		   return false;
			}
	    break;
	    } // Float Validation 


		case "pastdate":
		{
		if(!PastDate(objValue))
			{
			alert(strError+" : Should be Past Date...");
			return false;
			}
			break;
		}

		case "futuredate":
		{
		if(!PastDate(objValue))
			{
			alert(strError+" : Should be Future Date...");
			return false;
			}
			break;
		}

		case "todaydate":
		{
		if(!PastDate(objValue))
			{
			alert(strError+" : Should be Current Date...");
			return false;
			}
			break;
		}

        case "lt": 
        case "lessthan": 
         { 
            if(isNaN(objValue.value)) 
            { 
              alert(objValue.name+": Should be a number "); 
              return false; 
            }//if 
            if(eval(objValue.value) >=  eval(cmdvalue)) 
            { 
              if(!strError || strError.length !=0) 
              { 
                strError = strError + " : value should be less than "+ cmdvalue; 
              }//if               
              alert(strError); 
              return false;                 
             }//if             
            break; 
         }//case lessthan 
        case "gt": 
        case "greaterthan": 
         { 
            if(isNaN(objValue.value)) 
            { 
              alert(objValue.name+": Should be a number "); 
              return false; 
            }//if 
             if(eval(objValue.value) <=  eval(cmdvalue)) 
             { 
               if(!strError || strError.length !=0) 
               { 
                 strError = strError + " : value should be greater than "+ cmdvalue; 
               }//if               
               alert(strError); 
               return false;                 
             }//if             
            break; 
         }//case greaterthan 
        case "regexp": 
         { 
            if(!objValue.value.match(cmdvalue)) 
            { 
              if(!strError || strError.length !=0) 
              { 
                strError = strError+": Invalid characters found "; 
              }//if                                                               
              alert(strError); 
              return false;                   
            }//if 
           break; 
         }//case regexp 
        case "dontselect": 
         { 
            if(objValue.selectedIndex == null) 
            { 
              //alert("BUG: dontselect command for non-select Item"); 
			  alert(strError+": Please Select one option "); 
              return false; 
            } 
            if(objValue.selectedIndex == eval(cmdvalue)) 
            { 
             if(!strError || strError.length !=0) 
              { 
              strError = strError+": Please Select one option "; 
              }//if                                                               
              alert(strError); 
              return false;                                   
             } 
             break; 
         }//case dontselect 
    }//switch 
    return true; 
}