IE/FireFox compatible drag code_javascript skills

Features:
1. Compatible with IE6, FF, Opear (IE7 has not had a chance to test yet)
2. Smooth dragging
3. There is a transition between the starting point and the end point, making the movement smoother (adjustable)

Demo

/*
Author: misshjn
HomePage: http://www.happyshow.org
Date: 2007-04-30

Drag start
*/
function _getStyle(element,styleProp){
if (element.currentStyle){
var y = element.currentStyle[styleProp];
}else if (window .getComputedStyle){
var y = document.defaultView.getComputedStyle(element,null).getPropertyValue(styleProp.replace(/([A-Z])/g,"-$1").toLowerCase());
}
return y;
}
function _elementOnmouseDown(evt,blockID){
var obj, temp;
obj=document.getElementById(blockID);
var x = evt. clientX || evt.pageX;
var y = evt.clientY || evt.pageY;
obj.startX=x-obj.offsetLeft; >
var d = document.createElement("div");
d.style.position = "absolute";
d.style.width = obj.clientWidth parseInt(_getStyle(obj,"borderLeftWidth" ),10) parseInt(_getStyle(obj,"borderRightWidth")) -2 "px";
d.style.height = obj.clientHeight parseInt(_getStyle(obj,"borderTopWidth"),10) parseInt(_getStyle( obj,"borderBottomWidth")) -2 "px";
d.style.border = "1px dashed #666";
d.style.top = _getStyle(obj,"top");
d.style.left = _getStyle(obj,"left");
d.style.zIndex = "9999";
document.body.appendChild(d);
document.onmousemove=function(evt ){
d.style.left= (evt?evt.pageX:event.clientX) - obj.startX "px";
d.style.top= (evt?evt.pageY:event.clientY) - obj.startY "px";
};
document.onmouseup=function(){
var objL = parseInt(_getStyle(obj,"left"),10);
var objT = parseInt(_getStyle(obj,"top"),10);
var obj2L = parseInt(d.style.left,10);
var obj2T = parseInt(d.style.top,10);

var todolist = [];
var level = 10; //The transition level of element movement from the starting point to the end point, an integer greater than 0
var speed = 10; //Milliseconds, every The interval between moves. The larger the number, the stronger the sense of animation, but the greater the sense of jumping
for (i=1; i todolist.push(function(t){
setTimeout(function(){ obj.style.left = objL (obj2L-objL)*(t/level) "px";
obj .style.top = objT (obj2T-objT)* (t/level) "px";
if(t==i)todolist=null;
},speed*arguments[0]);
});
}
        for (i=1; i            todolist[i-1](i);
        }
        document.body.removeChild(d);
        document.onmousemove = null;
        document.onmouseup = null;
    };
}

/*
    拖动结束
*/