Running onClick function but not able to add the attribute in the html

[ntbgl]

I have a button on my page that looks like this:

<input id="wpSave" name="wpSave" type="submit" tabindex="5" value="Save page" accesskey="s" title="Save your changes [s]" />

Unfortunatly I can't edit this, but I would like to have javascript run a simple function if the button is clicked.

onClick="javascript: pageTracker._trackPageview('/outgoing/example.com');"

How can I have my script watch that button to run the script if someone clicks on it?

Thanks

[ntbgl]

I tried this, but it didn't seem to work:

document.getElementById('wpSave').onclick=function(){pageTracker._trackPageview('/outgoing/example.com');};

[rocknbil]

Unfortunately I can't edit this,

But you have access to the page template that contains it? See if you can attach a behavior onload. Untested, as I don't know the nature of "pageTracker":

<script type="text/javascript"> 
window.onload=function() { setTracker(); }; 
function setTracker() { 
 if (document.getElementById('wpSave')) { 
  document.getElementById('wpSave').onclick=function() { 
   pageTracker._trackPageview('/outgoing/example.com'); 
  }; 
 } 
} 
</script>