Timeline not defined error in firefox and chrome

[Google Code Exporter]

What steps will reproduce the problem?
1.Clear Cache
2.load page in Firefox or Chrome
3.Empty timeline appears on first Loading.If we refresh the page ,Timeline is 
displayed properly.

What is the expected output? What do you see instead?
Time line should be displayed properly every time .But it is not displayed when 
the page is loaded for first time in chrome and firefox

What version of the product are you using? On what browser and what
operating system?
windows 7 OS.
Problem with firefox and chrome.Properly working in IE9 and Opera.

Please provide any additional information below.
We are using prototype.js 1.6.1 and jquery.js.We get an exception  "throw 
$continue is deprecated use return instead" in firebug.And if we try to debug 
we get timeline not defined error.

Original issue reported on code.google.com by [e-mail] on 27 Jun 2012 at 5:19