Prevent Google Indexing Specific Content

[PsyMix]

I have some content that i want to prevent Google Indexing because its duplicated across a few sites.I understand I can use a \[code\]robots.tx\[/code\]t file to do this but the content doesn't exist on its on URL.Let me explain the content:When a user clicks on a button \[code\]jquery.load()\[/code\] will load a DIV with this content that is brought to the front of the page (z-index) kind of like a popup. The main 2 parts are a Join and Help section.Is there a way for me to prevent indexing?Its kind of like preventing indexing of a DIV or prevent indexing on a button click.The content is not on the page to start with...Its in a seperate PHP file which jquery requests if the user clicks on a link/button.Once that button/link is clicked its loaded into the DIV that resides in the DOM.