1// JavaScript Document
 2
 3var y=0;
 4var timeoutid=null;
 5
 6//滚在最下
 7function ScrollDown()...{
 8     timeoutid=null;   
 9     if(y<30000)...{   
10          y+=5000;  
11          scroll(0,y)   
12          clearTimeout(timeoutid)   
13          timeoutid=setTimeout("ScrollDown()",1)   
14      }   
15      else...{   
16          clearTimeout(timeoutid)    
17          y=0;
18      }   
19}
20      
21//滚到最上   
22function toTop()...{
23      scroll(0,0);
24}