Validator trying to validate javascript as HTML

The script on my page looks something like this:
 
<script language="javascript" type="text/javascript"> 
  function addOption(targetElement,value){
    for(var a=0 ; a<targetElement.length ; a++){
      if( targetElement[a].text == value) value = '-'
    }
    for(var a=targetElement.length;a!=0;a--){
      if( targetElement[a-1].selected)targetElement.remove(a-1)
    }
</script>

Validator thinks that because I use a "<" then its a HTML element.
 
<targetElement.length is not a valid element etc...
 
Ok ok ok..., I will put comments around the code then
 
<!-- 
  same script code
-->
 
Now it thinks that my "a--" in the script code ends the comment tag???
 
ehm.... hehe...
Any ideas ?
 


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