var currentElementFocus;

function toggleElement(e, targetId) {
  var event = e || window.event;
  var targetElement = document.getElementById(targetId);
  if ( currentElementFocus != null && currentElementFocus != targetElement ) {
    //alert("Test: " +currentFormFocus);
    currentElementFocus.style.display = "none";
    }
  if ( targetElement == undefined ) {
    alert("Element met id " +targetId+ " bestaat niet.");
    return;
    }
  if ( targetElement.style.display == "block" ) {
    targetElement.style.display = "none";
    currentElelementFocus = null;
    }
  else {
    targetElement.style.display = "block";
    currentElementFocus = targetElement; 
    }
  if (event.preventDefault) { // Firefox
    event.preventDefault();
    }
  else { // IE
    event.returnValue = false;
    }
  return;
	}