function isFilled(elm) {
	if (elm.value == "" || elm.value == null)
		return false;
	else
		return true;
}

function isEmail(elm) {
	if (elm.value.indexOf("@") + "" != "-1" && elm.value.indexOf(".") + "" != "-1" && elm.value != "")
		return true;
	else
		return false;
}

function validate(form) {

	if (isFilled(form.p_forename) == false) {
		alert("Please fill in your forename.");
		form.p_forename.focus();
		return false;
	}

	if (isFilled(form.p_surname) == false) {
		alert("Please fill in your surname.");
		form.p_surname.focus();
		return false;
	}

	if (isEmail(form.p_email) == false) {
		alert("Please insert a correct email address.");
		form.p_email.focus();
		return false;
	}

	return true;
}