Browser Compability Software for MacOS?

Being a web designer/developer, I use Adobe Dreamweaver to write the HTML and it has the feature to see a live view on different specified browsers. My question is:
Is there a stand-alone application for OSX.6.5 (like Microsoft Web Expressions) that is just a browser compatibilty utility? MS Web Expressions gives you options for overlaying, split screening and other useful tools, but refuse to dula boot! lol

Any help would be greatly appreciated🙂

Awesome

thanks a bunch....that sure is pretty simple, once you navigate thru all the goodies adobe.com has to offer...THANKS FOR THE HELP🙂