动态加载iframe

function goForward(URL){
    var URL = URL+"?encryptParam=8ACB2B7A053A1DA678119F4E9BED884E40A991B1D609F25B480DA373051DF301";

    //$("#framedemo").attr("src",URL);
    //document.getElementById("framedemo").setAttribute("src",URL);



    var documentHeight=$(window).height();
    var documentWidth=$(window).width();
    $(".rightpanel").height(documentHeight);
    $("#framedemo").height(documentHeight-55);
    $(".rightpanel").width(documentWidth-200);
    $("#framedemo").width(documentWidth-200);


    //framedemo.location.href=URL;
    document.getElementById("framedemo").setAttribute("src",URL);
}

function stateChangeIE(_frame){
    if (_frame.readyState=="interactive"){
        var loader = $("#load_img");
        loader.html("");
        loader.css("display","none");
        _frame.style.visibility = "visible";
    }
}

function stateChangeFirefox(_frame){
    var loader = $("#load_img");
    loader.html("");
    loader.css("display","none");
    _frame.style.visibility = "visible";
}

PS：IE浏览器兼容问题
IE浏览器下src对应的页面不显示 报错IE  RFC 7230 and RFC 3986   400 
是URL的问题 中间带了隐藏字符 去掉就可以了