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 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 "num": 
  case "numeric": 
  { 
   var charpos = objValue.value.search("[^0-9]"); 
   if(objValue.value.length > 0 &&  charpos >= 0) 
   { 
    if(!strError || strError.length ==0) 
    { 
     strError = "Please enter only digits (1, 2, 3, etc.) for your quantity."; 
    }//if               
    alert(strError); 
    return false; 
   }//if 
   break;               
  }//numeric 
 }//switch 
 return true; 
}