Client side script breaks after postback?

[Guest]

Hi all

I have a server side textbox on my page that has an OnBlur event that calls a vbscript function which validates the textbox (checks for a valid date) when the user leaves the control. If the date is not valid it shows a message and empties the contents of the textbox. The vbscript is registered in my page_Onload. When the page first loads this works fine, but after a postback to the server I get an error saying 'Object required Text1' , almost as if when the page is posted back it loses reference to my textBox. Does anyone have any idea why

Thanks in advance for any help with thi

Kur