How do notification cart Image?

Question

Hi  All,

 

   Currently   I am doing  Shppoing Cart Application, In that i require to give notification to user whenever user adding items in cart page. How can i do achieve this one. I have placed the  cart image in Masterpage. Whenever i added items in Cart Page .I want to make it count increment over the CartImage.

 

 Suggest me if you guys tend to knew this .

 

 

 

 Thanks in advance,

 

  Karthik K