Run report from ASP

Hi,

I've got this code in my ASP page:

myBlock.AddButton(strCallASPButton);
var sReportTarget = "/CRM/eware.dll/Do?SID=" + Request.QueryString("SID") + "&Act=1410&Mode=1&CLk=T&&Key0=41&Key4=" + CRM.GetContextInfo("user","user_userid") + "&Key41=186&Key62=151";
myBlock.AddButton(CRM.Button("Find Previously Purchased Items", "new.gif", sReportTarget, "Requisition", "EDIT"));

When a user opens the summary page, there is a button created by the above code. It runs a very specific report. How can I get this to appear in a pop up? It loads the page with the search parameters which is perfect, but I just want it to appear in a pop up. I tried PopUpWin=Y in the URL but it doesn't seem to do anything.

Thanks