function empty(obj,message){
	if(obj.value==''){
		doError(obj, true);
		return false;
	}
	doError(obj, false);
	return true;
}
function int(obj,message){
	if(parseInt(obj.value)!=obj.value){
		doError(obj, true);
		return false;
	}
	doError(obj, false);
	return true;
}
function email(obj,message){
	if(!/.+@.+\..+./.test(obj.value)){
		doError(obj, true);
		return false;
	}
	doError(obj, false);
	return true;
}

function doError(obj, bool) {
	if(bool) {
		obj.className = "error";
		obj.parentNode.getElementsByTagName("span")[0].style.display = "inline";
	}else {
		obj.style.className = "";
		obj.parentNode.getElementsByTagName("span")[0].style.display = "none";
	}
}

function setSubmitFunc(id, func) {
	if(document.getElementById&&document.createElement&&document.getElementsByTagName){
		document.getElementById(id).onsubmit=function(){return func()};
	}
}