How to avoid not to create another new window in Gridview?

Question

 
 Dear Buddies ,

                  I had a situation in the Gridview..that contain the Link Button. when i click the link button it will fetch  the data corresponding to the querystring variable.Those Information to be display in a new window..

                 In this if i click the same querystring variable , again it showed the data in another new window..i want it to be as, if it is loaded already that should not open new window...


If it is not loaded already , it should load on that page ..

This is My requirements ....


Thanks in advance

-karthik