[Kungfu]

good idea but bad javascript coding.

the javascript should be

<script language="javascript">
<!-- Hide from older browsers
function hideAll() {
 document.getElementById('purchDiv1').style.display='none';
 document.getElementById('purchDiv2').style.display='none';
}

function showCosmetic1() {
 document.getElementById('purchDiv1').style.display='block';
 document.getElementById('purchDiv2').style.display='none'; 
 document.getElementById('purchDiv1').style.visibility='visible';
}
function showCosmetic2() {
 document.getElementById('purchDiv2').style.display='block';
 document.getElementById('purchDiv1').style.display='none';
 document.getElementById('purchDiv2').style.visibility='visible';
}
// -->
</script>

this should make it work in any browser.