target question

target as in the form attribute

In my appl devl I utilize an extra window when my current form is asked 
to generate a pdf report.  Works well since that way the user can 
generate one report into a new window, read it, close it, and still have 
the reports menu in front of him/her and generate a 2nd report.

I'm experiencing a problem tho and I'm guessing it's associated with ie9 
or FPDF. In my reports menu form, when I click on a button that will 
generate a pdf, I alter the form's target to create a new window.  This 
used to work last fall, but since then I have a new laptop running ie9, 
not 8.  The target changing js logic is working as far as I can see 
(alerts in my js) but the effect is not there.  Instead of a new window, 
the pdf opens up in the same window where the menu was and so when the 
user does a back he ends up going up one too many levels and has to 
re-request the reports menu.

Didn't have this much trouble originally setting this up as I'm having 
now trying to debug this.  I'm using the FPDF extension/class to 
generate my pdfs - made no recent changes there.  Also my concept works 
very well still in a simple html document that has only two buttons on 
it which I created today to test a theory.  That is - maybe it's not 
just IE9, but FPDF.

Anyone have any experience in this area?