$(document).ready(function(){		
		$("#selectRegion").change(function(){
			if($(this).val()!=""){
				var dato=$(this).val();
				$("#imgcomuna").show();
				$.ajax({
					type:"POST",
					dataType:"html",
					url:"action.php",
					data:"id_region="+dato+"&tarea=listComuna",
					success:function(msg){
						//alert(msg);
						$("#selectComuna").empty().show().append(msg);
						$("#imgcomuna").hide();
					}
				});
			}else{
				$("#selectComuna").empty().attr("disabled","disabled");
			}	
		});
	});