NetScape下的拖拽问题

<html><head>
<script>//Thumbnail image viewer- 
//?Dynamic Drive (www.dynamicdrive.com)
//For full source code, usage terms, and 100's more DHTML scripts, visit http://www.dynamicdrive.comvar ie=document.all
var ns=document.layers
var ns6=document.getElementById&&!document.allfunction enlarge(which,e){
//Render image code for IE 4+ and NS6
if (ie||ns6){
crossobj=document.getElementById? document.getElementById("showimage") : document.all.showimage
if (crossobj.style.visibility=="hidden"){
crossobj.style.left=ns6? pageXOffset+e.clientX : document.body.scrollLeft+event.clientX
crossobj.style.top=ns6? pageYOffset+e.clientY : document.body.scrollTop+event.clientY
crossobj.innerHTML='<div align=right id=drag><b onClick=closepreview()>X</b></div><img src="'+which+'">'
crossobj.style.visibility="visible"
}
else
crossobj.style.visibility="hidden"
return false
}
//Render image code for NS 4
else if (document.layers){
if (document.showimage.visibility=="hide"){
document.showimage.document.write('<a href="#" onMouseover="drag_dropns(showimage)"><img src="'+which+'" border=0></a>')
document.showimage.document.close()
document.showimage.left=e.x
document.showimage.top=e.y
document.showimage.visibility="show"
}
else
document.showimage.visibility="hide"
return false
}
//if NOT IE 4+ or NS 4, simply display image in full browser window
else
return true
}function closepreview(){
crossobj.style.visibility="hidden"
}</script>
<script language="JavaScript1.2">//By Dynamicdrive.com//drag drop function for NS 4////
/////////////////////////////////var nsx,nsy,nstempfunction drag_dropns(name){
temp=eval(name)
temp.captureEvents(Event.MOUSEDOWN | Event.MOUSEUP)
temp.onmousedown=gons
temp.onmousemove=dragns
temp.onmouseup=stopns
}function gons(e){
temp.captureEvents(Event.MOUSEMOVE)
nsx=e.x
nsy=e.y
}
function dragns(e){
temp.moveBy(e.x-nsx,e.y-nsy)
return false
}function stopns(){
temp.releaseEvents(Event.MOUSEMOVE)
}//drag drop function for IE 4+ and NS6////
/////////////////////////////////function drag_drop(e){
if (ie&&dragapproved){
crossobj.style.left=tempx+event.clientX-offsetx
crossobj.style.top=tempy+event.clientY-offsety
}
else if (ns6&&dragapproved){
crossobj.style.left=tempx+e.clientX-offsetx
crossobj.style.top=tempy+e.clientY-offsety
}
return false
}function initializedrag(e){
if (ie&&event.srcElement.id=="drag"||ns6&&e.target.id=="drag"){
offsetx=ie? event.clientX : e.clientX
offsety=ie? event.clientY : e.clientYtempx=parseInt(crossobj.style.left)
tempy=parseInt(crossobj.style.top)dragapproved=true
document.onmousemove=drag_drop
}
}document.onmousedown=initializedrag
document.onmouseup=new Function("dragapproved=false")
</script>
</head><body><div id="showimage" style="position:absolute;visibility:hidden;border:1px solid black"></div><a href="photo1.jpg" onClick="return enlarge('photo1.jpg',event)"><img src="thumbnail.gif" border="0"></a><a href="photo1.jpg" onClick="return enlarge('photo1.jpg',event)">This is a text link</a></body>
</html>