if (document.images)
   {
   var imagepath_array = new Array();
   var index = -1;

   imagepath_array[++index] = 'preload/menu_01a.gif';
   imagepath_array[++index] = 'preload/menu_01b.gif';
   imagepath_array[++index] = 'preload/menu_02a.gif';
   imagepath_array[++index] = 'preload/menu_02b.gif';
   imagepath_array[++index] = 'preload/menu_03a.gif';
   imagepath_array[++index] = 'preload/menu_03b.gif';

   var imagepath_array_length = ++index;

   var imageobj_array = new Array();
   var loop = 0;

      for (loop = 0; loop < imagepath_array_length; loop++)
      {
      imageobj_array[loop] = new Image();
      imageobj_array[loop].src = imagepath_array[loop];
      }

   }