function isValid(emailexp, f) {
        return emailexp.test(f);
     }

function validate() {
	if (document.forms[0].cuName){
		var f = document.forms[0].cuName;
		if (f.value == ""){
			alert("Please enter your name.");
			f.focus();
			return false;
		} 
	}
		if (document.forms[0].email){
		var f = document.forms[0].email;
		var emailexp = /^[^@\s]+@([-a-z0-9]+\.)+[a-z]{2,}$/i;
		if (f.value == ""){
			alert("Please enter your email address.");
			f.focus();
			return false;
		} else if (!isValid(emailexp,document.forms[0].email.value)) {
			alert("Your email address is not in the correct format.");
			f.focus();
			return false;
		} 
	}
		if (document.forms[0].subject){
		var f = document.forms[0].subject;
		if (f.value == ""){
			alert("Please enter a subject.");
			f.focus();
			return false;
		} 
	}

}