APEX

I have tabular in in APEX page

In tabular form on one textbox onblur="setfocs();"

And i set focus on button using javascript as below.

<script type="text/javascript">
function setfocs()
{
document.getElementById('add_row_id').focus();
}
</script>
Javascript in HTML header part of the page.

'add_row_id' is button id.

That is working fine in Firefox but not working on IE and Chrome.
Can any one have idea?

Thanks