// JavaScript Document
        function showLayer(group, id) 
        { 
            //处理Item 
            var count = 1; 
            var obj = document.getElementById(group + "_item_" + count); 
            while (obj != null) 
            { 
                obj.className = "panel_item"; 
                 
                count++; 
                obj = document.getElementById(group + "_item_" + count); 
            } 
            document.getElementById(group + "_item_" + id).className = "panel_item_show"; 
             
            //处理Layer 
            count = 1; 
            obj = document.getElementById(group + "_layer_" + count); 
            while (obj != null) 
            { 
                obj.style.display = "none"; 
                 
                count++; 
                obj = document.getElementById(group + "_layer_" + count); 
            } 
            document.getElementById(group + "_layer_" + id).style.display = "block"; 
        }