Imagine Minimize

Hi,

I hope that I post where must to post.

I install now version 3.0 of wordpress and we also searched a plugin with
my imagines from post are minimize. I found some plugin but nothing good.

I wanted a plugin with all my imagines from post that are more 560×560 size to be minimize and if are minimize and if i click on the picture see it with the normal size (left click,)but i cant find anything.

If you have the plugin or know where to find, tell me please.