js自动切换图片

   DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"  > 
   html   xmlns  ="http://www.w3.org/1999/xhtml"  > 
    head  > 
     title  >  new document    title  > 
     meta   http-equiv  ="Content-Type"   content  ="text/html;charset=UTF-8"   /> 
     meta   name  ="author"   content  =""   /> 
     meta   name  ="keywords"   content  =""   /> 
     meta   name  ="description"   content  =""   /> 
     link   rel  ="stylesheet"   type  ="text/css"   href  =""   /> 
     style   type  ="text/css"  >  style  > 
     script   type  ="text/javascript"  >  
    window.onload  =  init;
      var   n  =  1  ;   //  图片标记数 
     var   dingshi;   //  让图片动的定时器 
     function   init(){
        dingshi  =  window.setInterval(  "  tupian()  "  ,  1000  );
    }
      //  更换图片 
     function   tupian(){
          var   obj  =  document.getElementById(  "  img1  "  );
        n  ++  ;
          if  (n  >=  4  ){
            n  =  1  ;
        }
        obj.src  =  "  yaj_  "  +  n  +  "  .jpg  "  ;
    }
      //  鼠标放上图片停止 
     function   stoptupian(){
        window.clearInterval(dingshi);
    }
      //  鼠标离开图片动起来 
     function   dongqilai(){
        dingshi  =  window.setInterval(  "  tupian()  "  ,  1000  );
    }
      script  > 
    head  > 
    body  > 
     img   src  ="yaj_1.jpg"   onmouseover  ="stoptupian()"    onmouseout  ="dongqilai()"   id  ="img1"  >  
    body  > 
   html  >  

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