APEX

I am trying to hide or show a region depending on the value of a radio button.
Radio button (P60_XX) has 2 possible values (1 and 2) and a default value of 2. My region has a static id of GD.

My onclick event works and the region displays or does not display, as it should, but I cannot get my onload to work, ie the region should not be displayed, as the default value is 2.

In my page header I have

<script type="text/javascript">
function GermDist(pThis) {
  if(pThis) {
     var lval= $v(pThis);
       if (lval == 2) {
              $x_Hide('GD');
                         } else if (lval == 1) {
              $x_Show('GD');
}}}
</script>

My onclick on P60_XX is

onclick="GermDist(this);" and works

My onload is

onLoad="GermDist('P60_XX');"  and does not work

Can anyone point out where I am going wrong please

Gus