I have a page with which I want to set focus to a specific input textbox as soon as the page is displayed. I have the following code after all the 'screen-painting' html code (but before the tag).

	<script>
		document.thisform.postcode.focus()
	</script>

I can briefly see the 'I-bar' flash in the field, then it disappears. Has anyone any idea what I might be doing wrong here? I've checked the code, and the form name is 'thisform', and the field name is 'postcode'.

TIA
Alan