// Javascript from Moodle modules
function getClasses(element) {
	if (document.getElementById(element).getAttribute("class")) return document.getElementById(element).getAttribute("class");
	else return document.getElementById(element).getAttribute("className");
}

function toggleClass(element,c1,c2) {
  var classes = getClasses(element).split(" ");
  
  for (i=0; i<classes.length; i++) {
    if (classes[i] == c1) classes[i] = c2;
    else if (classes[i] == c2) classes[i] = c1;
  }
  
	document.getElementById(element).setAttribute("class", classes.join(" "));
	document.getElementById(element).setAttribute("className", classes.join(" "));
}