function Validate(f)
{
	for(var i=0; i<f.elements.length; i++)
	{
			var element=f.elements[i];
			if(element.className.indexOf("mandatory") != -1)   //-1 means index found 
			{
					if(!isfilled(element))
					{
						alert ("Please enter your "+element.name);
						element.focus();
						return false;
					}
			}
			if(element.className.indexOf("mandatoryemailrequired")!= -1)			
			{
					if(!isemail(element))
					{
						alert ("Please enter valid email address");
						element.focus();
						return false;
					}
			}
	}
	return true;
}