I'm trying to use the tooltip as a lookup value window:
onclick="opener.document.form_formname.fieldID.value=<%=(rs.Fields.Item("field".Value)%>;self.close()"
How could I implement this code?

Hello Walter,

You need to work as within an iFrame. You can use document.parent. instead of opener.document. Also I would advice you to set hide tooltip on the input onChange or onBlur event instead inside the tooltip.

Regards,

Thanks. I'll try that and get back to you if any other question.