Switch Menu problem

[ladobonline]

1) Script Title:
Switch Menu

2) Script URL (on DD): http://www.dynamicdrive.com/dynamicindex1/switchmenu.htm

3) Describe problem:
Hi everybody!
I' doing a simple portfolio which contains 4 options (web design, grapfic design, multimedia and others). When I click on each one, that cathegory is displayed in the same window, using this script.

The problem is: When I select an option, it's ok, but, when I select a work to get more information... the cookie doesn't "remember" which "option" had been selected and the cathegory doesn't appear "open"....

I'm using php and mysql to do each cathegory...

Do you know what could be the problem????

I'm setting variables as: "yes" and "sitewide"

[ladobonline]

PS: To understand what I mean, please check out http://www.sawi.com.ar/piterman2/
(and try to select any work of web design cathegory, the "span" closes but if you click on it again you'll see that the link works ok. I mean I only need that the "span" selected remains open.... please help me!)