Javascript – Variable in function name, possible?

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Store your functions in an object instead of making them top level.

var at = {
    at_26: function() { },
    at_21: function() { },
    at_99: function() { }
};

Then you can access them like any other object:

at['at_' + test_id]();

You could also access them directly from the window object…

window['at_' + test_id]();

… and avoid having to store them in an object, but this means playing in the global scope which should be avoided.

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