set focus after postback

How can I set the focus to a control after postback?I have some javascript function to set the focus in onload event,but it looks like the onload event is not trigger after postback.ThanksThis will do what you want:

-- focus and select in a textbox
 Dim sb As New System.Text.StringBuilder
 sb.Append("<script language=javascript>")
 sb.Append("document.forms.myForm.txtMyBox.focus();")
 sb.Append("document.forms.myForm.txtMyBox.select();")
 sb.Append("</script>")
 If Not IsStartupScriptRegistered("MyBoxSelect") Then
 RegisterStartupScript("MyBoxSelect", sb.ToString())
 End If

Also, you might have a look @.view post 821121

regards