function setClassName(id, className) {
  var element;
  if(document.getElementById && (element = document.getElementById(id))) {
    element.className = className;
  }
}
function setImageSource(id) {
  var element;
  var currentImg;
  var lengthImg;
  var endingImg;
  var newImg;
  if(document.getElementById && (element = document.getElementById(id))) {
  	currentImg = element.src;
  	lengthImg = currentImg.length;
  	endingImg = currentImg.substring(lengthImg, lengthImg - 4);
  	newImg = currentImg.substring(0, lengthImg - 4) + "Active" + endingImg; 
    element.src = newImg;
  }
}