function validate_form ( )
{
    valid = true;
	msg = "Please fill in the following required fields;";

    if ( document.Contactus.Firstname.value == "" )
    {
        //alert ( "Please fill in your 'Name'" );
        valid = false;
		msg = msg+"\n- First Name";
    }
	
    if ( document.Contactus.Lastname.value == "" )
    {
        valid = false;
		msg = msg+"\n- Last Name";
    }
	
	if ( document.Contactus.Mobile.value == "" && document.Contactus.Home.value == "" && document.Contactus.Work.value == "")
    {
        valid = false;
		msg = msg+"\n- Either Mobile, Home or Work Number";
    }
	
	if ( document.Contactus.Interest.value == "" )
    {
        valid = false;
		msg = msg+"\n- Property or Locality of Interest";
    }

if ( valid==false )
    {
        alert ( msg );
    }
    return valid;
}