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 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);
}
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))
 {
		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
		if(email.length <= 0)
	{
		return true;
	}
		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;
}
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 = objValue.name + " : 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 = objValue.name + " : "+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 = objValue.name + " : " + 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.length > 0 &&  charpos >= 0)
							{
							 if(!strError || strError.length ==0)
								{
									strError = objValue.name+": Only alpha-numeric characters allowed ";
								}//if
								alert(strError + "\n [Error character position " + eval(charpos+1)+"]");
								return false;
							}//if
							break;
					 }//case alphanumeric
				case "checkbox":
					{
						if ( ! objValue.checked ) {
							alert ( strError );
							return false;
						}
						break;
					}//case checkbox
				case "address":
					{
						var charpos = objValue.value.search("[^A-Za-z0-9# \.]");
						if(objValue.value.length > 0 &&  charpos >= 0) {
						 if(!strError || strError.length ==0) {
								strError = objValue.name+": Only alpha-numeric characters allowed ";
							}
							alert(strError + "\n [Error character position " + eval(charpos+1)+"]");
							return false;
						}
						break;
					}//case address
				case "num":
				case "numeric":
					 {
							var charpos = objValue.value.search("[^0-9]");
							if(objValue.value.length > 0 &&  charpos >= 0)
							{
								if(!strError || strError.length ==0)
								{
									strError = objValue.name+": Only digits allowed ";
								}//if
								alert(strError + "\n [Error character position " + eval(charpos+1)+"]");
								return false;
							}//if
							break;
					 }//numeric
				case "phone":
					{
						var charpos = objValue.value.search("[^0-9 ()\-]");
						if(objValue.value.length > 0 &&  charpos >= 0) {
							if(!strError || strError.length ==0) {
								strError = objValue.name+": Only digits allowed ";
							}
							alert(strError + "\n [Error character position " + eval(charpos+1)+"]");
							return false;
						}
						break;
					}//phone
				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 = objValue.name+": Only alphabetic characters allowed ";
								}//if
								alert(strError + "\n [Error character position " + eval(charpos+1)+"]");
								return false;
							}//if
							break;
					 }//alpha
				case "alphaspace":
					{
						var charpos = objValue.value.search("[^A-Za-z \.]");
						if(objValue.value.length > 0 &&  charpos >= 0) {
							if(!strError || strError.length ==0) {
								strError = objValue.name+": Only alphabetic characters allowed ";
							}
							alert(strError + "\n [Error character position " + eval(charpos+1)+"]");
							return false;
						}
						break;
					}//alphaspace
				case "alnumhyphen":
					{
									var charpos = objValue.value.search("[^A-Za-z0-9\-_]");
									if(objValue.value.length > 0 &&  charpos >= 0)
									{
											if(!strError || strError.length ==0)
										{
											strError = objValue.name+": 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 = objValue.name+": Enter a valid Email address ";
								 }//if
								 alert(strError);
								 return false;
							 }//if
					 break;
					}//case email
				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 = objValue.name + " : 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 = objValue.name + " : value should be greater than "+ cmdvalue;
							 }//if
							 alert(strError);
							 return false;
						 }//if
						break;
				 }//case greaterthan
				case "regexp":
				 {
			if(objValue.value.length > 0)
			{
							if(!objValue.value.match(cmdvalue))
							{
								if(!strError || strError.length ==0)
								{
									strError = objValue.name+": 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");
							return false;
						}
						if(objValue.selectedIndex == eval(cmdvalue))
						{
						 if(!strError || strError.length ==0)
							{
							strError = objValue.name+": Please Select one option ";
							}//if
							alert(strError);
							return false;
						 }
						 break;
				 }//case dontselect
		}//switch
		return true;
}
/*
	Copyright 2003 JavaScript-coder.com. All rights reserved.
*/