Sorted:

joomla migration 1.5 to 2.5 error undifined-Collection of common programming errors

stop joomla 1.5 loading jquery twice-Collection of common programming errors

tinyMCE.activeEditor is undefined in joomla-Collection of common programming errors

Uncaught TypeError: Cannot read property 'length' of undefined, in Chrome, joomla website, jqueryui-Collection of common programming errors

Undefined method error?-Collection of common programming errors

Upgrading Joomla 1.5 site to 2.5 using jUpgrade unique article alias issue-Collection of common programming errors

Joomla 1.5.10 serious performance issues?-Collection of common programming errors

HD FLV Player shows “undefined” in player control buttons joomla-Collection of common programming errors

JDocumentRAW::addCustomTag() error on joomla component using jQuery.getJSON()-Collection of common programming errors

( ! ) Fatal error: Uncaught exception 'Exception Occured while migrating joomla 1.5 to 2.5-Collection of common programming errors