关于ext的分页有关问题 请高人指点多谢

 <link rel="stylesheet" type="text/css" 
 	href="../ext/resources/css/ext-all.css" /> 
  <script type="text/javascript" src="../ext/adapter/ext/ext-base.js"> </script> 
  <script type="text/javascript" src="../ext/ext-all.js"> </script> 
  <script type="text/javascript" src="../examples.js"> </script> 
  <script> 
  
 function renderSex(value){ 
         		if(value == 'male'){ 
         				return " <span style='color:red;font-weight:bold;'>男 </>" 
         			} 
         		else{ 
         					if(value == 'female'){ 
         								return " <span style='color:blue'>女 </>" 
         							} 
         				return " <span style='color:green;font-weight:lighter'>人妖 </>" 
         			} 
         		} 
  
 function renderDescn(value, cellmeta, record, rowIndex, columnIndex, store) { 
     var str = " <input type='button' value='查看详细信息' onclick='alert(\"" + 
         "这个单元格的值是：" + value + "\\n" + 
         "这个单元格的配置是：{cellId:" + cellmeta.cellId + ",id:" + cellmeta.id + ",css:" + cellmeta.css + "}\\n" + 
         "这个单元格对应行的record是：" + record + "，一行的数据都在里边\\n" + 
         "这是第" + rowIndex + "行\\n" + 
         "这是第" + columnIndex + "列\\n" + 
      	"这个表格对应的Ext.data.Store在这里：" + store + "，随便用吧。" + 
         "\")'>"; 
     return str; 
 } 
  
 Ext.onReady(function(){ 
 		 
 	var sm = new Ext.grid.CheckboxSelectionModel(); 
 		 
     var cm = new Ext.grid.ColumnModel([ 
     		new Ext.grid.RowNumberer(), 
     		sm, 
         {header:'编号',dataIndex:'id',sortable:true}, 
         {header:'名称',dataIndex:'name',sortable:true}, 
         {header:'性别',dataIndex:'sex',renderer:renderSex,sortable:true}, 
         {header:'描述',dataIndex:'descn',renderer:renderDescn,sortable:true} 
     ]); 
  
     var data = [ 
         ['1','name1','male','descn1'], 
         ['2','name2','male','descn2'], 
         ['3','name3','female','descn3'], 
         ['4','name4','descn4'], 
         ['5','name5','female','descn5'] 
     ]; 
  
     var ds = new Ext.data.Store({ 
         proxy: new Ext.data.HttpProxy({url:'grid.jsp?start=0&linit=10'}), 
         reader: new Ext.data.ArrayReader({}, [ 
             {name: 'id'}, 
             {name: 'name'}, 
             {name: 'sex'}, 
             {name: 'descn'} 
         ]) 
     }); 
     ds.load();