Javascript to add extra "alt" attributes for signature and avatar images

[Wellwisher]

Hello, SMF Devs and community,

I am trying to get Pinterest working - aren't we all?  I resorted to this thread and have almost made a breakthrough...
[Tip/Trick] Pin your bbc tag images with this jQuery Pinterest Plugin

If we add Pinterests nopin = "nopin"  image alt attribute to signature and avatar images it will set this baby in motion.

I am think some sort of Javascript to add this extra image alt attribute to signature and avatar images but I am just a nub with dreams guys.

Example:

<img style="border: 0px;" src="MY-IMAGE.png" width="100px" height="100px" nopin = "nopin" />