Javascript for hide sale price and grouping not working in IE9

Question

the following code is not working in IE9. does anyone know how to fix this? anyone else having this issue?
<script type="text/javascript">
var opt = document.getElementById('grouping');
if(opt.innerHTML == 'Choose One ') opt.style.display='none';
</script>
<script language="javascript"><!--
var onsale_{tag_productid} = "{tag_onsale}";
if (onsale_{tag_productid} == "0") {
     document.getElementById("rrpprice_{tag_productid}").style.display = 'none';
//--></script>
<script type="text/javascript">
document.getElementById('catdesc').style.display = "none";
</script>

Answer 1

You can look at this link:
http://vanderwal.com/limited-edition-nautical-panoramic-prints/g16-the-north
-light-and-sachem-pond-block-island
But it needs to be viewed in IE9 because that is where the issue is. For
some reason the JS is not hiding the sale price or the grouping.