Ukrywanie scrollbara w JavaScript
<script language=javascript>
function hidden()
{document.body.style.overflow='hidden';}
function unhidden()
{document.body.style.overflow='';}
</script>
<form>
<input type="button" value="hidden scrollbars" onclick="hidden()"><br>
<input type="button" value="unhidden scrollbars" onclick="unhidden()">
</form>