Looking for an equivalent to "parentElement" in Mozilla?

Hello all,

I have a situaion where I want to retrieve the "href" attribute of any "A" element on the page with the "onmouseover" event: <a href=" >>> http://blahblah.com <<< ">Blah.com</a>

Now here's the thing, I have a script that checks the Source Element on mouseover, if it's an "A" link, then it alerts the Href value. Problem is, I want it to do so even if the actual link text is several elements within the Href.

Example:
<a href="http://blahblah.com">Link</a>  == source element "A".
<a href="http://blahblah.com"><font color="blue"><i><b>Link</b></i></font></a> == source element "b".

Now, I devised a script that will loop through all of the elements until it finds the "A" element, but, it does not work in Mozilla. Darn. I use "parentElement" to do so. Is there an equivalent in Mozilla? I tried "parentNode", but this returns the top element, "body".

Here's the script I use:

function findA(isElemA){
    while(isElemA.parentElement){
        if((isElemA.tagName == "A") && (!lnk)){
           alert('Your "A" Element Href is'+isElemA.href);
        }
        else{
           isElemA = isElemA.parentElement;
           findA(isElemA);
        }
    }
}    
function isLink(event) {
   var evt = event ? event : window.event;
       if(evt.target){
          var myEvt = evt.target;
          findA(myEvt);
       }
       else if(evt.srcElement){
          var myEvt = evt.srcElement;
          findA(myEvt);
       }
    return null;
}
document.onmouseover = isLink;

Any help will be much appreciated.

Thanks...