title: How to undo the last checked checkbox?
body: <p>Hi I created a javascript function to check if the number of modules selected is greater than a given value. So each time a checkbox is called the function is called, and the function goes through all the checkboxes and calculates the total to see if it's greater. But the problem is when the user checks the checkbox and if the total credits is greater than the value, I want to set the checkbox as checked=false. But I don't which checkbox to undo. Is there any undo last click function in javascript?</p>