实现网页上的图片任意拖动

<style>
<!--
.drag{position:relative;cursor:hand}
-->
</style>
<script language="JavaScript1.2">
<!--

var dragapproved=false
var z,x,y
function move(){
if (event.button==1&#38;&#38;dragapproved){
z.style.pixelLeft=temp1+event.clientX-x
z.style.pixelTop=temp2+event.clientY-y
return false
}
}
function drags(){
if (!document.all)
return
if (event.srcElement.className=="drag"){
dragapproved=true
z=event.srcElement
temp1=z.style.pixelLeft
temp2=z.style.pixelTop
x=event.clientX
y=event.clientY
document.onmousemove=move
}
}
document.onmousedown=drags
document.onmouseup=new Function("dragapproved=false")
//-->
</script>

<img src=0001.jpg width=80 height=80 class="drag"><br><br>
<img src=0002.jpg width=80 height=80 class="drag"><br><br>
<img src=0003.jpg width=80 height=80 class="drag"><br><br>
<img src=0004.jpg width=80 height=80 class="drag">