user_off = new Image();
	user_off.src= '/images/button-cab-user.gif';
	user_on = new Image();
	user_on.src= '/images/button-cab-user.gif';
	
	teacher_off = new Image();
	teacher_off.src= '/images/button-cab-teacher.gif';
	teacher_on = new Image();
	teacher_on.src= '/images/button-cab-teacher.gif';
	
	var userActive = true;
	var teacherActive = false;
		
	function closDivs()
	{
		if (userActive == true)
		{
			document.getElementById('user_div').style.visibility = 'hidden';
			document.getElementById('user').src = user_off.src;
			userActive = false;
		}//end if
		else (teacherActive == true)
		{
			document.getElementById('teacher_div').style.visibility = 'hidden';
			document.getElementById('teacher').src = teacher_off.src;
			teacherActive = false;
		}//end else
	}//end closDivs
	
	
	function cabinetCenterRoll(id)
	{
		if (!(eval(id + 'Active == true')))
		{
			closDivs();
			document.getElementById(id).src = eval(id + '_on').src;		
			document.getElementById(id + '_div').style.visibility = 'visible';			
			eval(id + 'Active = true');
		}//end else		
	}//end pedagaCenterRoll