function $(id){ return document.getElementById(id); }
		document.onkeyup = keyCheck;
		function keyCheck(e){
			var keyId = (window.event) ? event.keyCode : e.keyCode;
			switch(keyId){
				case 37: try
						{
							location.href = $("flecha_izda").href; break; // izda	
						}
						catch (error) {break;}
				case 39: try
						{
							location.href = $("flecha_dcha").href; break; // dcha	
						}
						catch (error) {break;}
			}
		}