Ok Cancel Popup

Hi,

Please help me in the following.

When i clicks on a table view value its navigating to another page, i want a popup(ok/cancel) before the next page gets loaded.

When user clicks on OK it should go to the next page, if ts cancel it should stay on the same page.

I tried the same in iterator's onclientclick but its showing the popup in the same page and also when i clicks on the cancel its navigating to the next page. I dont want the popup to be displayed in the first page.

Thanks.