1] in the HEAD of your webpage place the following javascript code:
<script language="javascript">
function scrolltotop() {
scroll(0,0);
}
</script>

2] in your iframe code add: onload="scrolltotop()"
<iframe src="http://www.junponline.com/User/UserIFrame.php?id=47&Category=Wildlife" width="760" height="2000" frameborder="0" onload="scrolltotop()"></iframe>