onMouseDown="moveStart(event,'div_Drag_Move')"其中moveStart是一个js函数，div_Drag_Move是控件的id
整个js函数如下：
function moveStart(event, Id){
var oObj = $_Id(Id);
oObj.onmousemove = mousemove;
oObj.onmouseup = mouseup;
oObj.setCapture ? oObj.setCapture() : function(){};
oEvent = window.event ? window.event : event;
var dragData = {x : oEvent.clientX, y : oEvent.clientY};
var backData = {x : parseInt(oObj.style.top), y : parseInt(oObj.style.left)};
function mousemove(){
var oEvent = window.event ? window.event : event;
var iLeft = oEvent.clientX - dragData["x"] + parseInt(oObj.style.left);
var iTop = oEvent.clientY - dragData["y"] + parseInt(oObj.style.top);
oObj.style.left = iLeft;
oObj.style.top = iTop;
dragData = {x: oEvent.clientX, y: oEvent.clientY};
}
function mouseup(){
var oEvent = window.event ? window.event : event;
oObj.onmousemove = null;
oObj.onmouseup = null;
if(oEvent.clientX < 1 || oEvent.clientY < 1 || oEvent.clientX > document.body.clientWidth || oEvent.clientY > document.body.clientHeight){
oObj.style.left = backData.y;
oObj.style.top = backData.x;
}
oObj.releaseCapture ? oObj.releaseCapture() : function(){};
}
}