/*
  This function will give the menu item
  you are currently on a nice left border
  so that you know where you currently are.
  
  This takes a number, and styles the element
  with id menu#, if it exists with!
*/
function currentlyOn(idNum) {
  
  // String of the menu we are looking for
  var id = "menu"+idNum;
  
  // Apply style to it if it exists
  var elem = document.getElementById(id);
  if (elem) {
    elem.style.borderLeft = '2px solid black';
  }

}