function PopUp(url, width, height, options) {
	var sw = screen ? screen.width : 800;
	var sh = screen ? screen.height: 600;
	
	var left = (sw - width) / 2;
	var top  = (sh - height) / 3;
	
	options  = 'width=' + width + ',height=' + height + ',left=' + left + ',top=' + top + ',' + options;
	
	var hWin = window.open(url, '', options);
	if (hWin) {
		hWin.focus();
	}
}