Js + Css的popup提示窗口的实现

/*eMsg*/
var divTop,divLeft,divWidth,divHeight,docHeight,docWidth,i = 0;
var eMsg = new Object();
eMsg.lightSrc = '../image/message/light.gif';
eMsg.closeSrc = '../image/message/msgclose.gif';
eMsg.id = 'eMsg';
eMsg.obj = function(){return document.getElementById(eMsg.id);};