gridview and popup

[Harikrk]

hi all i have a gridview which shows the list of all users in my site. I have added view to each row. I have added a link button for this. On clicking this view i want to show a popup which shows the details of each user. i dont want to open a new window for this. I want to show this using a div popup. i have written javascript to make a div visible and invisible. But to fill the details in this div i need to run server side script. How can i do this without refreshing the grid. grid is placed inside a update panel Hope you understood my requirement thanks in advance