// $Revision: 3870 $

var lessonChanger = {	
  exercise: 
  {
	activate: function(id)
	{	
		var obj1 = document.getElementById("start"+id);
		var objActive = document.getElementById("start_link"+String(id));
		var objInactive = document.getElementById("start_link_inactive"+String(id));
	
		try
		{
			objActive.style.display = "";
			objInactive.style.display = "none";
			obj1.className = "start-exercise";
		}
		catch(e) {/*may be no such objects*/}
	},
    disactivate: function(id)
    {
		var obj1 = document.getElementById("start"+id);
		var objActive = document.getElementById("start_link"+String(id));
		var objInactive = document.getElementById("start_link_inactive"+String(id));
	
		try
		{
			objActive.style.display = "none";
			objInactive.style.display = "";
			obj1.className = "start-inaccessible";	
		}
		catch(e) {/*may be no such objects*/}
    }
  }
};