Referencing an iframes parent via javascript

I found an example of scrolling an iframe content page using an onmouse over approach from the parent page.  The following code works perfect until I place the example in a page which contains a FORM element, which do to the pages purpose.. needs to stay.

I've tried a few different ways of referencing the parent document, but I guess I'm missing an important item.  

Could someone please clear up the missing link?  Here is the code which works fine within a page *without* a Form element.


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* Parent page contains 2 links and the iframe
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<a href="#" onMouseover="scrollspeed=-3" onMouseout="scrollspeed=0">right</a>
<a href="#" onMouseover="scrollspeed=3" onMouseout="scrollspeed=0">left</a>

<iframe id="datamain" src="test2.htm" width=100% height=100 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=1 scrolling=no></iframe>
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* Content page contains the code
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<script language="JavaScript1.2">

//Scrollable content III- By http://www.dynamicdrive.com

var speed, currentpos=curpos1=0,alt=1,curpos2=-1
     
function initialize(){
    if (window.parent.scrollspeed!=0){
        speed = window.parent.scrollspeed
        scrollwindow()
     }
}

function scrollwindow(){
    temp=(document.all)? document.body.scrollTop : window.pageYOffset
        window.pageXOffset
        alt=(alt==0)? 1 : 0
     if (alt==0)
          curpos1=temp
     else
          curpos2=temp
     // window.scrollBy(0,speed)    scrolling up & down
     window.scrollBy(speed,0)     //scrolling left & right
     }

     setInterval("initialize()",10)

</script>

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Thank you in advance for your time...  KeithStart Free Trial