Set hidden item in Javascript

Hi,
I am having a hidden page item P4_SELECT in my page. I am trying to set this page item with a value in javascript function.
function getTheCurrentRow(triggerItem){
    alert( triggerItem.slice(6));
   document.getelementbyid(P4_SELECT).value=triggerItem.slice(6);
// $x(P4_SELECT).value=triggerItem.slice(6);
</script>Eventhough i am getting value in the alert getting javascript error "P4_SELECT Undefined" .
When i checked the "view Source" of the page it is having this line in it
<input type="hidden" name="p_t04" value="" id="P4_SELECT" />I tried
$x(P4_SELECT).value=triggerItem.slice(6);But getting same result only. Can't we set hidden item values in Javascript.
Regards,
Jyothi

Hi,
If you are on Apex 3.x or higher , try
function getTheCurrentRow(triggerItem){
alert( triggerItem.slice(6));
$s("P4_SELECT", triggerItem.slice(6));
/* Alert hidden item value you did set */
alert($v("P4_SELECT"));
</script>Here is link to Apex JavaScript API document where you can find functions $s and $v I did use
http://download.oracle.com/docs/cd/E14373_01/apirefs.32/e13369/javascript_api.htm#CDEEIGFH
Regards,
Jari

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