Hello, i have a website that i would like to add cart functionality. this is my current site. mfnano.com/ it is using K2. All i want is in every product like this mfnano.com/easy/easym-t to add an add to cart button (nothing else to change in the layout) and then from the cart the customer to buy it with a credit card. IS this possible to do it? i have to install first an ecommerce solution like virtuemart? It is easy to install virtuemart on my current site without destroying it?
I really dont know how to turn this site into a mini e-shop site.

trinitronic.com/joomla/nice-paypal-button-plugin

thanks for your reply but this is not exacly what i want. i want my customers to be able to buy with credit card without using paypal.
Im i install virtuemart in my joomla installation, it will create problems?. i should only install ecommerse solution to a new and empty joomla site?