// input validation for forms submitted from the web site
function checkform (form, maintenance_req)
{
    // ** START **
    if (form.Name.value == "") {
	alert( "Please fill out your name, so we know whom to contact." );
	form.Name.focus();
	return false ;
    }
    if (form.Email.value == "") {
	alert( "Please enter your email address, so we can respond to your request." );
	form.Email.focus();
	return false ;
    }
    if (maintenance_req) {
	if (form.MaintRequest.value == "") {
	    alert( "Please enter the maintenance request you wish us to address." );
	    form.MaintRequest.focus();
	    return false;
	}
    }
    else {
	if (form.Referral.value == "[None]") {
	    alert( "Please let us know where you heard about us!  Thanks!" );
	    form.Referral.focus();
	    return false ;
	}
    }
    // ** END **
    return true ;
}