/*
newImage
validates Image ressource
*/
var newImage = function(arg) {
 if (document.images) {
  rslt = new Image();
  rslt.src = arg;
  return rslt;
 }
}

/*
changeImages()
*/
var changeImages = function() {
 if (document.images && (preloadFlag == true)) {
  for (var i=0; i<changeImages.arguments.length; i+=2) {
   document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
  }
 }
 return true;
}
var preloadFlag = false;

var preloadImages = function () {
 if (document.images) {
  var a = newImage("/images/franet_patfra_o.gif");
  var b = newImage("/images/franet_eltfra_o.gif");
  var c = newImage("/images/franet_abnefra_o.gif");
  var d = newImage("/images/franet_astfra_o.gif");
  
  // deineId kann alles sein,.. auch A, B, C, D, etc... hauptsache es hat eine ID
    
  preloadFlag = true;
 }
 return true;
}