Dinamic CSS Choose

Hi, good night!

Well, that is my problem:
I’m workin’ in my own personal blog template. And I want to give to the visitor an option of color scheme.
I was thinkin’ about something like this:
I’ve two style-sheets in betwhin my <head> tag. If I could make a button (link, whatever.) that activates one of those style-sheets, my color scheme I’ll be switched.
But I hosting this blog in a Blogspot.com adress, so if I could do this dinamic code without using an external .css file, it would be great.

I think this option of interactivity with the client is a wonderfull thing. Gave him the option of choose the design of the site, cause if we could do this switch, with a tableless page, the entire design could be modified.

What do you think, guys?:moustache