In response to piemesons rant against jQuery, a Vanilla JavaScript(TM) solution (tested on FF and IE):
Put this in a script tag after your markup is loaded (right before the close of the body tag) and you'll get a similar effect to the jQuery example.
a = document.getElementsByTagName('a');
for (var i = 0; i < a.length;i++) {
a[i].getElementsByTagName('span')[1].onclick = function() { return false;};
}
This will disable the click on every 2nd span inside of an a tag. You could also check the innerHTML of each span for "description", or set an attribute or class and check that.