谁能给一个右键菜单的例子

//
// 添加右键菜单
var current_point_lng;
var current_point_lat;
var menu = new BMap.ContextMenu();
var txtMenuItem = [
     {     text: '设为左下角坐标',
         callback: function()
         {     document.getElementById("x0").value = current_point_lng;
             document.getElementById("y0").value = current_point_lat;
         }
     },
     {     text:'设为右上角坐标',
         callback: function()
         {     document.getElementById("x1").value = current_point_lng;
             document.getElementById("y1").value = current_point_lat;
         }
     }
];
for(var i=0; i <txtMenuItem.length; i++)
{     menu.addItem(new BMap.MenuItem(txtMenuItem[i].text,txtMenuItem[i].callback,100));
}
map.addContextMenu(menu);
map.addEventListener("rightclick", function(e)
     {     current_point_lng = format_lnglat(e.point.lng);
         current_point_lat = format_lnglat(e.point.lat);
     }
);


补充：
<div style="position:absolute; left: 10px; top: 465px; z-index:100">
     <table width=640>
         <tr>
             <Td width=50%>
                 <table width=100%>
                     <Tr>
                         <Td width=30%>
                             <font size=2 name="宋体">左下角经纬度:</font>
                         </td>
                         <td width=35%>
                             <input type=text id="x0" size=12>
                         </td>
                         <td width=35%>
                             <input type=text id="y0" size=12>
                         </td>
                     </tr>
                     <Tr>
                         <Td width=30%>
                             <font size=2 name="宋体">右上角经纬度:</font>
                         </td>
                         <td width=35%>
                             <input type=text id="x1" size=12>
                         </td>
                         <td width=35%>
                             <input type=text id="y1" size=12>
                         </td>
                     </tr>
                 </table>
             </td>
         </tr>
     </table>
</div>
<script>
function format_lnglat(v)
{    return v;
}
</script>