//控制浏览器显示的高宽

        function document_loaded() {

            GotoMainStep();

            var WH = document.body.scrollHeight*/;

            document.getElementById("main1").style.height = WH + "px";

            var WW = document.body.scrollWidth *  / ;

            document.getElementById("main2").style.height = WW + "px";

            //js预加载

            //setTimeout(function () {

            //    if(window.parent && window.parent.YZLoader && window.parent.YZLoader.cache)

            //        window.parent.YZLoader.cache();

            //}, 50);

        }