多浏览器兼容的获取元素和鼠标的位置的js代码

//获取元素的位置 
function getLeft(obj) { 
if (obj == null) 
return null; 
var mendingObj = obj; 
var mendingLeft = mendingObj.offsetLeft; 
while (mendingObj != null && mendingObj.offsetParent != null && mendingObj.offsetParent.tagName != "BODY") { 
mendingLeft = mendingLeft + mendingObj.offsetParent.offsetLeft; 
mendingObj = mendingObj.offsetParent; 
} return mendingLeft; 
}; 
function getTop(obj) { 
if (obj == null) 
return null; 
var mendingObj = obj; 
var mendingTop = mendingObj.offsetTop; 
while (mendingObj != null && mendingObj.offsetParent != null && mendingObj.offsetParent.tagName != "BODY") { 
mendingTop = mendingTop + mendingObj.offsetParent.offsetTop; 
mendingObj = mendingObj.offsetParent; 
} 
return mendingTop; 
}; 
//获取鼠标的位置 
function getMousePosition(event) { 
var position = { 
MouseX: 0, 
MouseY: 0 
} 
if (event.pageX != undefined) { 
position.MouseX = event.pageX; 
position.MouseY = event.pageY; 
} 
else { 
var target = EventUtil.getTarget(event); 
position.MouseX = event.offsetX + getLeft(target); 
position.MouseY = event.offsetY + getTop(target); 
} 
return position;