//根据浏览器类型判断选择search区域图片的样式
        var content;
        if(navigator.appName == "Netscape"){
            content = "<div style='width:19px;float:right;height:18px;'><img alt='' src='images/index/search.gif' style='width:19px;height:17px;border:0px;' /></div>";
        }
        if(navigator.appName == "Microsoft Internet Explorer"){
            content = "<div style='width:19px;float:right;height:18px;padding-top:2px;'><img alt='' src='images/index/search.gif' style='width:19px;height:17px;border:0px;' /></div>";
        }