drill down in browser

Hi All,

I am working on drill down option on new window and it is working fine in report viewer.The target report as opening as pop up box in report viewer.

The same report i am using in my application using JSAPI coding.In this case the target report is opening as new tab in browser instead of pop up box.

I want it should open as pop up box.Please suggest me what to do to achieve this.
It's urgent for me.

Thanks in advance.
Swapna.