var newWin;

/* a function that opens a centered window for my image popups. */ 

function centeredWindow(url,winname,w,h) {
windowleft = (screen.width - w)/2;
windowtop = (screen.height - h)/2;
settings = '"toolbar=no,directories=no,menubar=no,scrollbars=yes,resizable=no,status=no,width='+w+',height='+h+ ',left='+windowleft+',top='+windowtop+'"';
closeWindow();
newWin = window.open(url,winname,settings);
newWin.focus();
}

function centeredWindowTwo(url,winname,w,h) {
windowleft = (screen.width - w)/2;
windowtop = (screen.height - h)/2;
settings = '"toolbar=no,directories=no,menubar=no,scrollbars=no,resizable=no,status=no,width='+w+',height='+h+ ',left='+windowleft+',top='+windowtop+'"';
closeWindow();
newWin = window.open(url,winname,settings);
newWin.focus();
}

function closeWindow() {
if (newWin && !newWin.closed) {
newWin.close();}
}