function validate_form()
{
  var elName = document.getElementById("form_firstname");
  var elSurname = document.getElementById("form_surname");
  var elStreet = document.getElementById("form_street");
  var elTown = document.getElementById("form_town");
  var elPostcode = document.getElementById("form_postcode");
  
  if(elName.value == "")
  {
    elName.focus();
	alert("Please enter your first name");
	return false;
  }
  
  if(elSurname.value == "")
  {
    elSurname.focus();
	alert("Please enter your surname");
	return false;
  }
  
  if(elStreet.value == "")
  {
    elStreet.focus();
	alert("Please enter your street name");
	return false;
  }
  
    if(elTown.value == "")
  {
    elTown.focus();
	alert("Please enter your Town");
	return false;
  }
  
    if(elPostcode.value == "")
  {
    elPostcode.focus();
	alert("Please enter your Postcode");
	return false;
  }

  return true;
}