Clicking in the blue box will pop up a "Hello World!" alert window. Clicking on the first link will take you to the YUI website; clicking on the second link, which has the same
href attribute, will pop up an alert instead and not navigate to a new page.
Event Utility is used here to do two things:
clickevent handler to the blue box;
<a>element that uses
YAHOO.util.Event.preventDefault()to prevent the link, when clicked, from navigating to a new page.
Click for Hello World alert.
The YUI Library. (Link navigates away from page.)
The YUI Library. (Link's default behavior is suppressed.)