<head>
<style>
.sf{position:relative;cursor:hand;color:black}
</style>
<script>
var drag=false;var a,x,y
function mov(){
if (event.button= =1&&drag){
a.style.pixelLeft=p1+event.clientX-x
a.style.pixelTop=p2+event.clientY-y
return false}}
function gj(){
if (event.srcElement.className= ="sf"){
drag=true;a=event.srcElement
p1=a.style.pixelLeft
p2=a.style.pixelTop
x=event.clientX;y=event.clientY
document.onmousemove=mov}}
document.onmousedown=gj
document.onmouseup=new Function("drag=false")
</script></head>
An example how to put the class attribute into a tag:
<img src="bild.jpg" class=sf>
or for text <span class=sf>Text to drag</span>
