Trigger Automatic Postback In Javascript?

Feb 15, 2011

I do not have access to the <body> tag because it is in masterpage. I want to trigger an automatic postback when the page load as:

<script type="text/javascript">
window.onscroll= __doPostBack("<%= button.ClientID %>", "");
</script>

where should I put this code? I get a Not implemented JS error if I place it just before the </asp:Content> tag.

PS: I need to trigger that postback because I want to populate an updatepanel when the page loads

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