Color code php inside of css in Dreamweaver

[spuddly]

I'm creating a dynamic css stylesheet with php variables in it. I would like to have any code that appears inside the tags color coded as if it was a php file, while everything outside is css color coded.As it is now, everything is color coded for css and the file is .css (I'd like to keep the .css file extension).I'm using Dreamweaver CS3 on Windows 7.Thanks