repeater and slideshow with ajax asp.net vb

i have a slidesshow using ajax control toolkit, and at the bottom of the slideshow i have a repeater that display thumbnail images. The question i have is how do i pass the value id from the thumbnail, when someone click on the thumbnail it triggers the itemcommand and get the picture id, to the slideshow so that the slideshow display that picture and then the next one in the set. the files i have in my project are default.aspx, default.aspx.vb and slideservice.vb. please help me. thank you in advance for your help.