// Find all the form input elements
  var input = document.getElementsByTagName(“input”);
  for ( var i = 0; i < input.length; i++ ) {
  
      // Find all the checkboxes
      if ( input[i].getAttribute(“type”) == “checkbox” ) {
  
          // Uncheck the checkbox
          input[i].removeAttribute(“checked”);
  
      }
  
  }