Image caching problem

[scott212]

I've got a community site build in progress and it handles image uploads to be associated with an identity. When the script uploads the image it of course resizes, renames, and places the image in the users directory. Well now that I've added the ability to change that image, since the new image is in the same place as the old one and has the same name, the browser has a hard time letting go of the old one. Anyone got any ideas on how this should be handled?

For now I'm using an old flash cheat that sorta works where you append a random number to the end of the html image call such as:
[code]

<img src="blahblah.jpg?rand=<? echo rand(0,999); ?>" /> 

// result: <img src="blahblah.jpg?rand=567" />

[/code]