(50分)firefox下如何实现window.event.clientX
如题,这个js在ie下能正常显示,怎么修改才能兼容firefox?
function showad(id) {
var addiv = document.getElementById(id);
var x = window.event.clientX;
var y = window.event.clientY;

addiv.className="showad";
addiv.style.top = y+ "px";
addiv.style.left = x+ "px";
}

这是个onMouseOver触发的事件,谢谢~~~
请说的简单一点最好给我个例子,我是个初学者

[解决办法]
onMouseOver="showad(event,'id')"

function showad(e,id) {
var addiv = document.getElementById(id);
e=e||event;
var x = e.clientX;
var y = e.clientY;

addiv.className="showad";
addiv.style.top = y+ "px";
addiv.style.left = x+ "px";
}