弹出层 禁用后页

<div id="divDisable" style="display: none;width:expression(document.getElementById('mdiv').scrollWidth);height:expression(document.body.scrollHeight); z-index: 1000; position: absolute;left: 0px; top: 0px;filter:alpha(opacity=50); background-color:White"></div>

弹出层，禁用后页

 $("mywin0").style.visibility="visible"; //mywin0是自己要显示的那个层
 document.getElementById("divDisable").style.display="";
 window.parent.menu.document.getElementById("divDisable").style.display="";
 window.parent.parent.topFrame.document.getElementById("divDisable").style.display="";
 window.parent.parent.footerFrame.document.getElementById("divDisable").style.display="";

关闭层

	$("mywin0").style.visibility="hidden";  
	 document.getElementById("divDisable").style.display="none";