(function($) {
var Bild = new Array();
$.fn.hw_preloader = function(path,pictures,callback){
         var pics = pictures.split(",");
         var i = 0;
         function help(){
                 i++;
                 if(i == pics.length){
                         if($.isFunction(callback)){
                                 callback();
                         }
                 }
         }
         for(a=0;a<pics.length;a++){
                 Bild[a] = new Image();
                 Bild[a].onload = help;
                 Bild[a].src = path + pics[a] + '.jpg';
         }
         return this;
};
})(jQuery)