How to disable a button using Java Script in Apex

Hi All,
I was trying to disable a button when the value of a select list item in the same page is equal to zero. Following are the steps which I did.
1) Created a new button template as <table class="t9StandardButton" id="#BUTTON_ID#" cellspacing="0" cellpadding="0" border="0" summary="">
2) Changed the existing button template to the newly created button template.
3) Added onchange="javascript:fdisplay(this);" to form element value of select list
4) Added the following java script in the page header
<script type="text/javascript">
function fdisplay(some) {
if (some.value==0){
html_GetElement ('#BUTTON_ID#').disabled = true;
else
html_GetElement ('#BUTTON_ID#').disabled = false;
</script>
But the script doesn't work. Is there anything I am missing here. Please advice.
Thanks,
Vikas

Vikas:
In the 'Button Attributes' field of the button enter 'id='thisButton'.
Modify the button template to include the substitution string #BUTTON_ATTRIBUTES# . This should be put in the anchor tag in the template defintion.
Modify your Javascript to reference the above id as
html_GetElement ('thisButton').disabled = true;
....Varad

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