CodeceptJS run java script code

Anybody here who can give me a hint to execute custom Javascript inside a CodeceptJS script?
I need to close a layered window and I currently cannot do it with codeceptJS default calls, so I want to close it with jQuery.
I use
	I.executeScript(function() {

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Inside my test, but I only get the error message that $ is not defined.
Ingo FoersterProject LeaderAsked:
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Robert PerezFront-end DeveloperCommented:
Hello Ingo,

Did you import the JQuery scripts in your <head></head>

As per Jquery's website the script should be:

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Ingo FoersterProject LeaderAuthor Commented:
Many thanks for the quick help
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