Error in my ? Please help

Hi guys,

Ive been using the script for the centred pop-up window from the kirupa tutorial and it works fine in Firefox, but IE is picking up a Javascript error, and hence not “popping open” the window. I can’t seem to see the problem for the life of me. Could someone help me spot the error?

Here’s a snippet of my function which calls the JS

Movieclip.prototype.openWinCentre = function (url, winName, w, h, toolbar, location, directories, status, menubar, scrollbars, resizable) { 
	//address, target_winName, width, height, toolbar, location, directories, status, menubar, scrollbars, resizable


Thanks in advance!