function addOnloadEvent(fnc){
  if ( typeof window.addEventListener != "undefined" ) {
    window.addEventListener( "load", fnc, false );
  } else if ( typeof window.attachEvent != "undefined" ) {
    window.attachEvent( "onload", fnc );
  } else {
    if ( window.onload != null ) {
      var oldOnload = window.onload;
      window.onload = function ( e ) {
        oldOnload( e );
        window[fnc]();
      };
    } else {
      window.onload = fnc;
    }
  }
}

function makePreloadImages(imgList) {
    return function() {
        var preLoad = new Array();
        for (i in imgList) {
            preLoad[i] = new Image();
            preLoad[i].src = imgList[i];
        }
    }
}