function validateForm(opt)
{
	if(obj.first_name.value == "")
	{
		alert("Please enter your First Name.");
		obj.first_name.focus();
		return;
	}
	if(obj.last_name.value == "")
	{
		alert("Please enter your Last Name.");
		obj.last_name.focus();
		return;
	}
	if(obj.email.value == "")
	{
		alert("Please enter your Email Address.")
		obj.email.focus();
		return;
	}
	var email_pat = /^[a-z][a-z0-9_\.\-]*[a-z0-9]@[a-z0-9]+[a-z0-9\.\-_]*\.[a-z]+$/gi;
	if(obj.email.value.search(email_pat) == -1)
	{
		alert("Invalid Email");
		obj.email.focus();
		obj.email.select();
		return;
	}
	if(obj.comments.value == "")
	{
		alert("Please enter comment");
		obj.comments.focus();
		return;
	}
	obj.action = "contact_us.php";
	obj.submit();
}