Here's The Code:
<style type="text/css">
td.text td.text table table table td a img {width:100px;}
td.text td.text table table table td div img {width:80px;}
td.text td.text table table td img {width:260px; max-width:260px; width:auto;}
td.text td.text table table td div img {width:80px;}
* html td.text td.text table table td img {width:260px;}
* html td.text td.text table table td a img {width:90px;}
* html td.text td.text table table td div img {width:80px;}
</style>

The only downfall is that if they post an image smaller, it will make it bigger. I know, that part sucks, but atleast they cant post a super huge pictures.

I dont really recommend using this, but you may be more anoyed with the fact that friends are posting GIANT pictures.