Pop Up Window Problem

Hi,
I found the centered pop up window forum on here very useful. I copy/pasted the code to put on my button and I have the images width and height set and somehow I keep getting white borders around the whole image and sometimes the bottom of the image gets chopped off? Any ideas? Thanks for the help!

Here is what I have on the button itself:

on (release) {
// customize the window that gets opened
// 0 equals NO.
// 1 equals YES.
address = “http://www.mikedemarzo.com/nittany.htm”;
target_winName = “Nittany”;
width = 576;
height = 384;
toolbar = 0;
location = 0;
directories = 0;
status = 0;
menubar = 0;
scrollbars = 0;
resizable = 0;
// sends data back to the function
openWinCentre(address, target_winName, width, height, toolbar, location, directories, status, menubar, scrollbars, resizable);
}

Then on the action keyframe I have this:

Movieclip.prototype.openWinCentre = function (url, winName, w, h, toolbar, location, directories, status, menubar, scrollbars, resizable) {
getURL (“javascript:var myWin; if(!myWin || myWin.closed){myWin = window.open(’” + url + “’,’” + winName + “’,’” + “width=” + w + “,height=” + h + “,toolbar=” + toolbar + “,location=” + location + “,directories=” + directories + “,status=” + status + “,menubar=” + menubar + “,scrollbars=” + scrollbars + “,resizable=” + resizable + “,top=’+((screen.height/2)-(” + h/2 + “))+’,left=’+((screen.width/2)-(” + w/2 + “))+’” + “’)}else{myWin.focus();};void(0);”);
}