function openWindow(file, width, height)
{
	var width		= width? width : '768';
	var height	= height? height : '560';
	
	LeftPosition = (screen.width) ? (screen.width-600)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-470)/3 : 0;
	features = 'toolbar=no, location=no, directories=no, menubar=no,' + 
    'scrollbars=no, resizable=no, width=' + width + ', height=' + height + ', top=' + TopPosition + ', left=' + LeftPosition;
	dlg = window.open (file,'imageWindow',features);
	dlg.document.bgColor="000000";
	dlg.document.body.topMargin = 0;
	dlg.document.body.leftMargin = 0;
	dlg.focus();
}