changing width of attachments if too big

[squishi]

I created a mobile style. Some attachments break the layout.

I am in need of a conditional, that checks the image width, and - if the attachment thumbnail is too big - sets the width of that thumbnail to a certain value.

Is that possible? I think I've seen code like that in the blog addon, but I have a hard time finding it again.

--------------- Added [DATE]1216366782[/DATE] at [TIME]1216366782[/TIME] ---------------

Okay, I found something the code I meant:

<img src="$userinfo[profilepicurl]" $userinfo[ppwidth] $userinfo[ppheight] alt="<phrase 1="$userinfo[username]">$vbphrase[xs_profilepic]</phrase>" border="0" class="alt2" style="<if condition="$userinfo['ppwidthpx'] > 180">max-width:180px; height:auto; width:auto !important; width:180px<else />display:inline</if>" />

Hmm, I guess that will not be helpful here.
And the code for the attachments is in a php file, no?
Is there no other way as to modify the source code? Maybe a plugin could be created that checks the width of the attachment thumbnails?