var GB_ROOT_DIR = "/include/greybox/greybox/";


GB_myShow = function(caption, url, /* optional */ height, width, callback_fn) {
var options = {
	caption: caption,
	height: height || 480,
	width: width || 500,
	fullscreen: false,
	show_loading: false,
	callback_fn: callback_fn
}
var win = new GB_Window(options);
return win.show(url);
}