前台页面弹出div,背景变灰

//背景变灰

function changeGray(){

var sWidth,sHeight;

sWidth=screen.width;//屏幕宽

sHeight=screen.height;//屏幕高

var bgObj=document.createElement("div");

bgObj.setAttribute('id','bgDiv');

bgObj.style.position="absolute";

bgObj.style.top="0";

bgObj.style.background="#cccccc";

bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75)";

bgObj.style.opacity="0.6";

bgObj.style.left="0";

bgObj.style.top="0";

bgObj.style.width=sWidth + "px";

bgObj.style.height=(sHeight+100) + "px";

bgObj.style.zIndex = "100";

document.body.appendChild(bgObj);

}

//取消变灰

function deleteDiv(){

var my = document.getElementById("bgDiv");

if (my != null)

my.parentNode.removeChild(my);

}