Hi,
Just do 'alert' the  window.open parameter. And one more thing while setting optional parameters in the window.open function,

 "scrollbars=1,location=0,directories=0,statu
+s=0,width=550,height=375,toolbar=0,menubar=0,resizable=0"
[download]

I guess it might be like

 
"scrollbars=1;location=0;directories=0;statu
+s=0;width=550;height=375;toolbar=0;menubar=0;resizable=0"
[download]

Before that, Try with some static pages and make sure that javascript is working fine. Otherwise i'm sure that you may miss some values which is dynamically passing into the  window.open function.
Thanks.
-kulls