function cambiarFondo(value)
	{
		var tdBg = document.getElementById('bg');				
		switch(value)
		{
			case '1':
				tdBg.className = 'bgAzul';				
				break;				
			case '2':
				tdBg.className = 'bgCeleste';
				break
			case '3':
			    tdBg.className = 'bgGris';
			    break
			case '4':
			    tdBg.className = 'bgBlanco';
			    break
			default:
			    tdBg.className = 'bgBlanco';
			    break
		}
		document.getElementById('hidColor').value=value;
	}
	
	function leerColorAnterior()
	{
		var tdBg = document.getElementById('bg');
		value=document.getElementById('hidColor').value;		
		switch(value)
		{
			case '1':
				tdBg.className = 'bgAzul';				
				break;				
			case '2':
				tdBg.className = 'bgCeleste';
				break
			case '3':
			    tdBg.className = 'bgGris';
			    break
			case '4':
			    tdBg.className = 'bgBlanco';
			    break
			default:
			    tdBg.className = 'bgBlanco';
			    break
		}	
	}