yes it should be possible to do this, I have some bookmarks here that should help you get started 
Thanks Dave but it's too much complicate for me, I don't have the knowledgebase for create a jquery script code.
WebAssist offer the possibility (with payment) to create a personalization about your eCart (not refresh page)?
If not, do you know any ecommerce solution with ajax implementation?
Regards,
Michele


