I'm not sure if this will work but, first of all, consider that you cannot change the scroll position of an external page that you have no access to. With that in mind, I'd try putting the external page in an iframe with width and height set to width="100%" height="2000" or some such thing and scrolling="no". Have this iframe be on a separate page with the body tag on that page looking something like this:
Code:
<body onload="window.scrollTo(0,x)">
Where x is how far down you want it to scroll. Put this page in your original iframe.
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