function isEmail(s){
	var i = 1;
	var sLength = s.length;
	while ((i < sLength) && (s.charAt(i) != "@")){ i++ }
	if ((i >= sLength) || (s.charAt(i) != "@")) return false;
	else i += 2;
	while ((i < sLength) && (s.charAt(i) != ".")){ i++ }
	if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
	else return true;
}
function ValidateForm(form){
	if((form.login.value != "")&&(form.login.value != null)){
		if(!isEmail(form.login.value)){
			alert("Please enter a valid email address.");
			form.login.value="";
			form.login.focus();
			return false;
		}
	} else {
			alert("Please enter an email address.");
			form.login.focus();
			return false;
	}
	if(form.password.value == ""){
		alert("Please enter your password.");
		form.password.focus();
		return false;
	}
	return true;
}