function openWindow(url,w,h) {
	var winName = 'NaviWindow';
	var Width   = 'width='   + w;
	var Height  = ',height=' + h;
	var Left    = ',left='   + ((screen.width - w) / 2);
	var Top     = ',top='    + ((screen.height- h) / 2);
	var Option = ',status=0,menubar=0,scrollbars=0,resizable=0';
	var features = Width + Height + Left + Top + Option;
	winName = window.open(url,winName,features);
	if (window.focus) {
		winName.focus();
	}
}