Is there a possibility to change a background image for every week automatically?

[piku]

Hello everybody!

 

Last week I started to create a template and slowly I am getting there ...

In the "global.css" I defined a background image to the header area. (My logo is a partially transparent overlay sitting on top of the background ...)

 

Now my question is whether there is a way in CSS or within the smarty arsenal to switch this background image according to the current date? I would like to have a set of background pictures that get switched every week (or according to a time table) like a calendar (a new image every week :-))

 

My first impulse was to write 52 CSS files (only containing the background-image definition) that get loaded dependent on the current date but I don't get the right conditional php statement together (should be added to the "header.tpl"-file, I guess) ...

 

Any better ideas?

 

thx for your attention,

piku