var objImage = new Image;

function swapImage(strName, booVisibility) {
	objImage = getObj(strName);
	/* alert(objImage.src); */
	if (booVisibility) {
		objImage.src = 'Images/nav_' + strName + '_active.gif';
	} else {
		objImage.src = 'Images/nav_' + strName + '.gif';
	}
}

function getObj(name)
{
  if (document.getElementById)
  {
  	objObject = document.images[name];
  }
  else if (document.all)
  {
	objObject = document.images[name];
  }
  else if (document.layers)
  {
   	objObject = document.images[name];
  }
  return objObject;
}