function preloadImages()
{ 
   if (document.images)
   {
      var imgFiles = preloadImages.arguments;
      var preloadArray = new Array();
      for (var i=0; i<imgFiles.length; i++)
      {
         preloadArray[i] = new Image;
         preloadArray[i].src = imgFiles[i];
      }
   }
}

function swapImage()
{
   var i,j=0,objStr,obj,swapArray=new Array,oldArray=document.swapImgData;
   for (i=0; i < (swapImage.arguments.length-2); i+=3)
   {
      objStr = swapImage.arguments[(navigator.appName == 'Netscape')?i:i+1];
      if ((objStr.indexOf('document.layers[')==0 && document.layers==null) ||
         (objStr.indexOf('document.all[')   ==0 && document.all   ==null))
         objStr = 'document'+objStr.substring(objStr.lastIndexOf('.'),objStr.length);
      obj = eval(objStr);
      if (obj != null)
      {
         swapArray[j++] = obj;
         swapArray[j++] = (oldArray==null || oldArray[j-1]!=obj)?obj.src:oldArray[j];
         obj.src = swapImage.arguments[i+2];
      }
   }
  document.swapImgData = swapArray;    //used for restore
}

function swapImgRestore()
{
   if (document.swapImgData != null)
      for (var i=0; i<(document.swapImgData.length-1); i+=2)
         document.swapImgData[i].src = document.swapImgData[i+1];
}