function validate(formName,errorElement,errorClass){
	var form = document.forms[formName];
	var okay = true;
	for(var i=0; i<form.elements.length; i++){
		var element=form.elements[i];
		if(element.className.search(/required/)!=-1){
			if(!element.value){
				okay = false;
				if(errorClass){
					element.className = element.className + " " + errorClass;
				}
			}
			else{
				if(errorClass){
					element.className = element.className.replace(errorClass, "");
				}
			}
		}
	}
	var e = document.getElementById(errorElement);
	if(e){e.style.display=(okay?"none":"inline");}
	return okay;
}