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You can incorporate js directly in link by

                <cell>Link^javascript:alert(1);^_self</cell>

or, if you want to add onSomething event, then you can use the next dirty solution:

                <cell>Link^javascript:void(0)' onclick='alert(1);^_self</cell>

If you haven't found the needed information there and still looking for a solution, you will find the additional help checking date picker in javascript and dhtml gui.