JS: Copying a text to the clipboard.

I want to add a javascript function to copy a specific text to the clipboard. I found this code:

<script language="javascript">
function toClipboard(){
  var text="http://www.FindYourDesire/findyourdesire/profile.php?u n=Neo";
  var copyText=text.createTextRange();
 
  return confirm("Do you want to copy the link
http://www.FindYourDesire/findyourd...file.php?un=Neo to your clipboard?
(this only works for M$IE");
  copyText.execCommand("Copy");
  alert("If using M$IE, then you have just copied the link,
http://www.FindYourDesire/findyourd...file.php?un=Neo to your clipboard.");
}
</script>

and changed it a little to what I need:

<script language="javascript">
function toClipboard(text){
  var copyText=text.createTextRange();

  copyText.execCommand("Copy");
}
</script>

Unfortunately, this doesn't work (the bold line raises the following error:

---------------------------
Error
---------------------------
A Runtime Error has occurred.
Do you wish to Debug?

Line: 3000
Error: Object doesn't support this property or method
---------------------------
Yes   No  
---------------------------

Can anyone give me a hint?