Why doesn\'t this work?
Just to clarify, only FireFox suffers from this issue. See http://www.devtoolshed.com/content/fix-firefox-click-event-issue. In FireFox, anchor (a) tags have no click() function to allow JavaScript code to directly simulate click events on them. They do allow you to map the click event of the anchor tag, just not to simulate it with the click() function.
Fortunately, ASP.NET puts the JavaScript postback code into the href attribute, where you can get it and run eval on it. (Or just call window.location.href = document.GetElementById('LinkButton1').href;).
Alternatively, you could just call __doPostBack('LinkButton1'); note that 'LinkButton1' should be replaced by the ClientID/UniqueID of the LinkButton to handle naming containers, e.g. UserControls, MasterPages, etc.
Jordan Rieger