// JScript 文件
function onoff(tbname){ 
    if ( document.getElementById(tbname).className.toString()=='downpic'){ 
          document.getElementById(tbname).className = "rightpic"; 
           document.getElementById(tbname).title = "展开"; 
    }else{ 
     document.getElementById(tbname).className = "downpic"; 
           document.getElementById(tbname).title = "收缩"; 
    } 
    
} 




function hidd_display()
{
   var tab=document.getElementById("mytd");
   var td_r=document.getElementById("td_r");
   if(tab.style.display=="none")
   {
       tab.style.display = "block"; 
       td_r.className = "downpic"; 
       td_r.title = "收缩"; 
   }else{ 
     tab.style.display = "none"; 
       td_r.className = "rightpic"; 
       td_r.title = "展开"; 
     
    } 
  
}


function changeimg()
{
   document.getElementById("chk_img").src="../ValidateImageHandler.ashx?"+rand(10000000);
}

    rnd.today=new Date(); 

    rnd.seed=rnd.today.getTime(); 

    function rnd() { 

　　　　rnd.seed = (rnd.seed*9301+49297) % 233280; 

　　　　return rnd.seed/(233280.0); 

    }; 

    function rand(number) { 

　　　　return Math.ceil(rnd()*number); 

    };