Pop up error in explorer

Hi there, I am quite new in actionscript, and I’m having some trouble with pop up windows and IE:d:
Well, my actionscript looks like this:

[FONT=Courier New][COLOR=Teal]Movieclip.prototype.openWinCentre = function(url, winName) { getURL("javascript:openNewWindow(‘description_win.php?imagePath=images/portfolio/big/1.jpg&textValue=descrizione immagine 1’,‘Punto Net Service - Descrizione lavoro’,‘height=470,width=520,toolbar=no,scrollbars=no’));
};[/COLOR]

[FONT=Verdana] with firefox there aren’t any problems but IE gives me an error without opening any popUp window[/FONT]
“[COLOR=Teal]argument no valid[/COLOR]” -

[FONT=Verdana] Any suggestions?
Thanks in advance.[/FONT]
[/FONT]