function init() {
		
		
		var tree = new YAHOO.widget.TreeView("treediv");
		
		
		var root = tree.getRoot();
		
		
		    var ahmedDocsRootOne = new YAHOO.widget.TextNode("初中化学", root, true);
            
            ahmedDocs = new YAHOO.widget.TextNode("第一章 走进化学世界", ahmedDocsRootOne, true);
        	myobj = { label: "第一节 物质的变化和性质", id:"101" } ;	
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
 	        myobj = { label: "第二节 化学是一门以实验为基础的科学", id:"102" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
                myobj = { label: "第三节 走进化学实验室", id:"103" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
			   myobj = { label: "走进化学单元测试", id:"11" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false); 
          
           
            
            
            ahmedDocs = new YAHOO.widget.TextNode("第二章 我们周围的空气", ahmedDocsRootOne, true);
            myobj = { label: "第一节 空气", id:"104" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
 	        myobj = { label: "第二节 氧气", id:"105" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
            myobj = { label: "第三节 制取氧气 ", id:"106" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
			 myobj = { label: "我们周围空气单元测试", id:"12" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false); 
          
 
            ahmedDocs = new YAHOO.widget.TextNode("第三章 自然界的水", ahmedDocsRootOne, true);
            
            myobj = { label: "第一节 水的组成 ", id:"107" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
           	
 	        myobj = { label: "第二节 分子和原子", id:"108" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
            
            myobj = { label: "第三节 水的净化", id:"109" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
            
            myobj = { label: "第四节 爱护水资源 ", id:"110" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false); 
			 myobj = { label: "自然界的水单元测试", id:"13" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
            
          
            
            
            ahmedDocs = new YAHOO.widget.TextNode("第四章 物质构成的奥秘 ", ahmedDocsRootOne, true);
            myobj = { label: "第一节原子的构成  ", id:"111" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
           	
 	        myobj = { label: "第二节元素", id:"112" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
            
            myobj = { label: "第三节离子 ", id:"113" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
            
            myobj = { label: "第四节化学式与化合价", id:"114" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false); 
			 myobj = { label: "物质构成单元测试", id:"14" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
            
            
            
            ahmedDocs = new YAHOO.widget.TextNode("第五章 化学方程式", ahmedDocsRootOne, true);
            myobj = { label: "第一节质量守恒定律", id:"115" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
           	
 	        myobj = { label: "第二节如何正确书写化学方程式 ", id:"116" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
            
            myobj = { label: "第三节利用化学方程式的简单计算", id:"117" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
             myobj = { label: "化学方程式单元测试", id:"15" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
            
            
            
            ahmedDocs = new YAHOO.widget.TextNode("第六章 碳和碳的氧化物", ahmedDocsRootOne, true);
            myobj = { label: "第一节金刚石、石墨和C60 ", id:"118" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
           	
 	        myobj = { label: "第二节二氧化碳制取的研究   ", id:"119" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
            
            myobj = { label: "第三节二氧化碳和一氧化碳 ", id:"120" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
			myobj = { label: "碳单元测试", id:"16" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
			
	
            
            
            
            ahmedDocs = new YAHOO.widget.TextNode("第七章 燃料及其利用 ", ahmedDocsRootOne, true);
            myobj = { label: "第一节燃烧和灭火", id:"121" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
           	
 	        myobj = { label: "第二节燃料和热量", id:"122" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
            
            myobj = { label: "第三节使用燃料对环境的影响 ", id:"123" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
			
			myobj = { label: "燃料及应用单元测试", id:"17" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);    
           
             ahmedDocs = new YAHOO.widget.TextNode("第八章 金属和金属材料", ahmedDocsRootOne, true);
            myobj = { label: "第一节金属材料  ", id:"124" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
           	
 	        myobj = { label: "第二节金属的化学性质", id:"125" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
            
            myobj = { label: "第三节金属资源的利用和保护 ", id:"126" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
			
			myobj = { label: "金属及金属材料单元测试", id:"18" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);    
          

　　 
	
			 ahmedDocs = new YAHOO.widget.TextNode("第九章 溶液", ahmedDocsRootOne, true);
            myobj = { label: "第一节溶液的形成   ", id:"127" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
           	
 	        myobj = { label: "第二节溶解度 ", id:"128" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
            
            myobj = { label: "第三节溶质的质量分数", id:"129" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
			
			myobj = { label: "溶液单元测试", id:"19" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
            
      
            
            ahmedDocs = new YAHOO.widget.TextNode("第十章 酸和碱", ahmedDocsRootOne, true);
            myobj = { label: "第一节常见的酸和碱", id:"130" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
           	
 	        myobj = { label: "第二节酸和碱之间会发生什么反应", id:"131" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
			myobj = { label: "酸和碱单元测试", id:"20" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
           
			
  
            ahmedDocs = new YAHOO.widget.TextNode("第十一章 盐　化肥 ", ahmedDocsRootOne, true);
            myobj = { label: "第一节生活中常见的盐", id:"132" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
			   
           	
 	        myobj = { label: "第二节化学肥料", id:"133" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
			myobj = { label: "盐　化肥单元测试", id:"22" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false); 
            
          
            
            
            
            
            ahmedDocs = new YAHOO.widget.TextNode("第十二章 化学与生活", ahmedDocsRootOne, true);
            myobj = { label: "第一节人类重要的营养物质  ", id:"134" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
           	
 	        myobj = { label: "第二节化学元素与人体健康 ", id:"135" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);
            
            myobj = { label: "第三节有机合成材料 ", id:"136" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false); 
			myobj = { label: "化学与生活 单元测试", id:"22" } ; 
			var ahmedMsWord = new YAHOO.widget.TextNode(myobj, ahmedDocs, false);  
        
		
		var sushDocs = new YAHOO.widget.TextNode("其他", root, true);
		
	
			
			
		myobj = { label: "各地中考", id:"9" } ; 
		var ahmedMsWord = new YAHOO.widget.TextNode(myobj, sushDocs, false);
			
			
		myobj = { label: "化学竞赛", id:"10" } ;
		var ahmedMsWord = new YAHOO.widget.TextNode(myobj, sushDocs, false);
			
			
			
            tree.subscribe("labelClick", function(node) { 
            
	           if(node.data.id)
              {
                  currentlessonid = node.data.id;
            }
              else
              {
                 currentlessonid =0
            } 
            if($('inputtext'))
            {
              if(node.data.label)
              {
                 $('inputtext').value  = node.data.label;
              }
              else
              {
                 $('inputtext').value  = "" ;
              }
            }
			else
			{
			   getpage(1);
			}
	       }); 
	
	
	 

	
		tree.draw();
        tree.collapseAll();
        ahmedDocsRootOne.expand(); 
	}
	
     function begin() {
	  setTimeout("init()",2000); 

	}
    YAHOO.util.Event.onDOMReady(begin);