JAVASCRIPT need help! i cant get rid of it

I need the ‘please select a checkbox’ to be gone when i select a checkbox and click for an answer. but apparently, it is there no matter how i try.

for (var i = 0, count = events.length; i < count; i++) {
        var checkbox = U.$(events[i]); // Get the element.
        if (checkbox.checked == true) { // Is it checked?
           U.addEvent(document, events[i], reportEvent);	   
        } else {
            U.removeEvent(document, events[i], reportEvent);

 if (checkbox.checked == true) {
	U.$('output').value = "";
 } else {
	U.$('output').value = 'please select a checkbox';

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