function start_clock() 
	{
		
		if (timer_clock)
			clearInterval(timer_clock);
			
		timer_clock = null;
		
		if ($('clock'))
		{
			timer_clock = setInterval("make_clock('hours', 'minutes', 'secundes')", 1000);
		}
					
	}
					    
	make_clock = function(h, m, s)
	{

		var t = new Date();
		$(h).innerHTML = t.getHours() < 10 ? '0'+t.getHours() : t.getHours();
		$(m).innerHTML = t.getMinutes() < 10 ? ':0'+t.getMinutes() : ':'+t.getMinutes();
		$(s).innerHTML = t.getSeconds() < 10 ? ':0'+t.getSeconds() : ':'+t.getSeconds();
	}