Incompatibility with Jquery 1.3+ and Drupal
I noticed an incompatibility with the latest versions of Jquery (Ver 3+) and Drupal. the following error message was being shown:
[Exception... "'Syntax error, unrecognized expression: [@disabled]' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "<unknown>" data: no]
This was causing a problem loading the FCK elements on the node edit page. the solution was to use jquery version 1.2.6

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