function openNewWindow(urlToOpen, windowName, winWidth, winHeight){
	windowLeft = Math.round((screen.width - winWidth) / 2 );
	windowTop = Math.round((screen.height - winHeight) / 2);
	windowSettings = '"toolbar=no,directories=no,menubar=no,scrollbars=no,resizable=no,status=no,width='+winWidth+',height='+winHeight+',left='+windowLeft+',top='+windowTop+'"';
	theWindow = window.open(urlToOpen, windowName, windowSettings);
	theWindow.focus();
}