function show_div(){   
var obj_div=document.getElementById("morelinkbox");   
obj_div.style.display=(obj_div.style.display=='none')?'block':'none'; 
}    
function   hide_div(){
var obj_div=document.getElementById("morelinkbox");   
obj_div.style.display=(obj_div.style.display=='none')?'block':'none';    
 }
 
 
 function getCookie(firstname,secondname)//取cookies函数
{
    var   dc   =   document.cookie; 
    //document.all("ta1").value=dc;
    var   fbegin=dc.indexOf(firstname+"=");
    if(fbegin<0)
      return null;
    //alert(fbegin);
    var   fend=dc.indexOf(";",fbegin);
    //alert(fend);
    if(fend==-1)
      fend=dc.length;
    //alert(fend);
    var   prefix=secondname+"=";
    var   begin=dc.indexOf(prefix,fbegin); 
    //alert(begin);
    var   end=-1;
    var   end1=document.cookie.indexOf( ";",begin); 
    var   end2=document.cookie.indexOf( "&",begin);
    //alert(end1);
    //alert(end2);
      if(end1==-1&&end2==-1)
         end=dc.length;
      else
      {
         if(end1>=0&&end2<0)
         end=end1;
         else if(end1<0&&end2>=0)
         end=end2;
         else if(end1<0&&end2<0)
         end=dc.length;
         else if(end1>end2)
         end=end2;
         else if(end2>end1)
         end=end1;
         else
         end=dc.length;
      }
     // alert(end);
      if(fbegin<=begin&&fend>=end)
      {
        var value=dc.substring(begin +prefix.length,end);
        if(value==null||value=="")
            return null;
        else
         return decodeURI(dc.substring(begin +prefix.length,end));
      }
      else
      return null;
}


function delCookie(firstname,secondname)//删除cookie
{
    var exp = new Date();
    exp.setTime(exp.getTime() - 10000);
    var cval=getCookie(firstname,secondname);
    if(cval!=null)
	document.cookie= firstname+"=;expires="+exp.toGMTString()+";domain=datihu.com;path=/";

}

function showdiv(type)  //true 是现实要登录，false是要注销
{
   
   if(type)
   {
    var str=getCookie('user','realname');
    if(str!=null&&str!="")
    {
        document.getElementById('dlogin').style.display='block';
        document.getElementById('dunlogin').style.display='none';
        document.getElementById('spusername').innerHTML="你好,<b>"+str+"</b>!";
    }
     else
        {
            str=getCookie('user','name');
            if(str!=null&&str!="")
            {
             document.getElementById('dlogin').style.display='block';
             document.getElementById('dunlogin').style.display='none';
              document.getElementById('spusername').innerHTML="你好,<b>"+str+"</b>!";
            }
             else
              {
              document.getElementById('dunlogin').style.display='block';
              document.getElementById('dlogin').style.display='none';
              document.getElementById('spusername').innerHTML="用户名";
              }
        }
   }
   else
   {
        delCookie('user','name');
        document.getElementById('dunlogin').style.display='block';
        document.getElementById('dlogin').style.display='none';
        document.getElementById('spusername').innerHTML="用户名";
   }
}