function  validate_form() {
	return checkFields() && checkEmail();
}

function checkFields() {
	var fields = document.getElementById("quoteForm").elements;
	var x;
	for (x=13; x<=16; x++) {
		if (fields[x].value=="") {
			alert("Please complete all required forms");
			return false;
		}
	}
	return true;
}

function checkEmail() {
	with (document.getElementById("quoteForm").elements[16]) {
		var apos=value.indexOf("@");
		var dotpos=value.lastIndexOf(".");
		if (apos<1 || dotpos-apos<2) {
			alert("Please enter a valid email.");
			return false;
		}
		else {
			return true;
		}
	}
}