var filename = Array();
var images = Array();
var path = "images/";
var x=0;

//-- PUT IMAGE FILENAMES HERE, IMAGES SHOULD BE INSIDE images/ FOLDER --

  filename[x++] = 'sidebar-gray-button-hover.jpg';
  filename[x++] = 'sidebar-blue-button-hover.jpg';

//----------------------------------------------------------------------

  for(var i=0;i<filename.length;i++){
    images[i] = new Image();
    images[i].src = path+filename[i];
  }