Add to cart, Cart modul without Itemid

[CZBios]

Hi, i have big problem and i nicelly beg you for help.

I have joomla 1.7.2 and VM 1.9.8j.

I have one category with 20 products in it. In menu i have one menu item wich is VirtueMart » VirtueMart Category Layout type.

Problem:
In product details view or category view i click on add to cart button, fancy box show is msg with pieces and product and link CART SHOW. Link which supposed to show the content of the cart is missing in url param Itemid.
The same it is in virtuemart cart modul. There also in button add to cart and product links is missing this params.

Please, help me.

I look over the forum and internet, i tried to manipulate item id or at least figure it ou the error of my instalation of virtuemart in php files and so far no luck!
Thank you very much!