Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
The Anchor function will allow the insertion of a link into your UI. Most web pages have links to go elsewhere, and this is how you add a link in GS:
function Anchor() {
var mydoc = SpreadsheetApp.getActiveSpreadsheet();
var app = UiApp.createApplication().setTitle('Anchor');
var mainPanel = app.createVerticalPanel().setId('mainPanel');
app.add(mainPanel);
var googleLink = app.createAnchor('Google', 'http://google.com');
app.add(googleLink);
mydoc.show(app);
}