function checkForm() {

  message="";
  
  for(i=0;i<document.webform.elements.length;i++)
  {
    if ((document.webform.elements[i].value == "") && (document.webform.elements[i].name != "Omschrijving") && ((document.webform.elements[i].type == "text") || (document.webform.elements[i].type == "select-one") || (document.webform.elements[i].type == "textarea")))
	{
	  message = message + document.webform.elements[i].name + " is niet ingevuld!\n";
	}
  }
  if((document.webform.elements.Email.value.indexOf('@') <= 0))
  {
  	message = message + "Het ingevulde email adres is geen geldig email adres!\n";
  }
  if (message!= "")
  {
	alert(message);
	return false;
  }
  else
  {
	return true;
  }
}