refresh image in asp.net page

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how to refresh a image control to pick up the latest image file on a asp.net
page. i am generating a image based on the input from the user and displaying
it on the page through image control. The problem is that i am not able to
get the latest image on the page, it keeps showing the old page. But when i
hit the refresh button on the toolbar it correctly gets the latest image and
displays it in the control. But that has another problem, it pops up a dialog
asking user whether he wants to retry or cancel...

so in short i need to implement some logic so that the image control is
refreshed when the image changes (i know exactly when the image changes) and
dont popup any dialog box for user input.

any help is greatly appreciated

thanks, Ramendra