unspecified error

i'm using this code to open a picture in a different window:

Code:

---

function popUp(picPath){
                        popWin = window.open(picPath,"Informations","width=440, top=100, left=0 , height=440, menubar=0, location=0, toolbar=0, personalbar=0, status=0,resizable=0, scrollbars=0");
                        popWin.focus();
                }

---

but after a couple of time on clicking on it(without closing it) i
get an 'unspecified error', and it's never consitent,i.e. it could be after
the 3rd time or the 5th time, it's never the same!

What the problem, should i destroy the popWin object???

tx