if (document.images)
    {
      preload_image_object = new Image();
      // set image url
	  ArrayImg = new Array();
	  for (i=0;i<nom.length;i++)
		{
		ArrayImg[i] = fileName[i]
		}

       var i = 0;
       for(i=0; i<=3; i++) 
         preload_image_object.src = ArrayImg[i];	 
    }