Textbox control not found when in originally hidden div
within this div is a standard asp text box with validation and a submit button. this button fires off an email script that takes the value from the text box.
thanks for the response, i have looked into the code further now and it wasn't a simple show/hide (i didn't build that part) it was using thickbox/jquery so that was the problem.
i then just removed that and turned it into modal popup using ajax tookit. one thing i came across is that the modal panel close button cannot be within a ajax update panel as it will not close once updated!