function chkFields() 
{
if (document.mainform.u_firstname.value == "")
	{
		alert
		("Please enter your first name.");
		document.mainform.u_firstname.focus();
		return false;
	}

if (document.mainform.u_lastname.value == "")
	{
		alert
		("Please enter your last name.");
		document.mainform.u_lastname.focus();
		return false;
	}
	
if (document.mainform.u_phone.value == "")
	{
		alert
		("Please enter your phone.");
		document.mainform.u_phone.focus();
		return false;
	}
	
if (document.mainform.u_email.value == "")
	{
		alert
		("Please enter your email address.");
		document.mainform.u_email.focus();
		return false;
	}
}