QF changing target of a Form at runtime

Hello, I might have a problem that is not easy to understand. I have a QF page with about 30 different input fields and 4 different send buttons. 3 of those buttons should be sended to the same page wich is no problem at all, also the different states of the buttons are easy to handle. The 4th button should send the data to the same page, but it should open a popup after sending. I did those by calling a jscript (window.open) after processing the data. The big problem is that because of popupblockers we gt more and more support trouble. I now wonder if I can solve this issue with a little javascript wich is called by the sending button. This javascript should edit the target tag of the form to _blank, so the Browser itself starts an new Window. Is that solution possible? Or do you know a better ? How can the send button call the jscript? Thank you for your help Mirco