// JavaScript Document
function on(id){
	prod = document.getElementById(id);
	prod.style.display = "block";
	
}
function off(id){
	prod = document.getElementById(id);
	prod.style.display = "none";
	
}

function validateForm(){
	message = '';
	error = 0;
	
	if (document.contact_form.first_name.value == '') { 
		message = 'First name is a required field\n'; 
		error = 1;
	}
	if (document.contact_form.last_name.value == '') { 
		message = message + 'Last name is a required field\n'; 
		error = 1;
	}
	if (document.contact_form.email.value == '') { 
		message = message + 'Email is a required field'; 
		error = 1;
	}
	
	if (error) {
		alert(message);
		return false;
	} else {
		return true;
	}
}