[development] Imagecache : File is cached by browser.

Hi, I am using imagecache for my user profile page, when i update image with a new image imagecache doesn't rename the image file name but successfully update the image on the server. Browser cached the image and shows the old image upon refresh, I wanted to ask if I can programmatically get around this problem? have u had problems with stale image showing even after updating the image with new one? Any ways to get around it? Cheers Dipen