Having Slide In appear only on Marketpress pages?

Hello,

I want the Slide In plugin to only appear on my Marketpress pages. I am using Slide In as a floating shopping cart which would be perfect if it had the option of only showing up on my Marketpress pages and not the rest of the site.

Also, is there any way I can remove the option of closing the Slide In from the visitor? I do not want them to accidentally close their cart and then panic out of fear of not knowing how to get it back and continue the check out process.

My site is proav.celabs.net.