// JavaScript Document
function validateContactForm() {

var theForm = document.getElementById("contactForm");
var valid = true;

if (theForm.first_name.value ==""){
	alert ("please enter your first name");
	valid = false;
	theForm.first_name.focus();
}


if (theForm.last_name.value == "") {
	alert ("please enter your last name");
	valid = false;
	theForm.last_name.focus();
}

if (theForm.email.value == "") {
	alert ("please enter your email address");
	valid = false;
	theForm.email.focus();
}

if (theForm.message.value == "") {
	alert ("please enter your message");
	valid = false;
	theForm.message.focus();
}

if (valid == true) {
	return true;// submit form
} else{
	return false; //form invalid
}
}