fixed 定位兼容ie6
/*修正ie6 闪烁bug*/ * html,* html body{background-image:url(about:blank);background-attachment:fixed;} /*对话框 fixed 定位*/ #loginDialog { position:fixed; top:125px; left:50%; _position:absolute; _top:expression(eval(document.documentElement.scrollTop+125)); _left:expression(eval(document.documentElement.clientWidth)/2); }