function tcc(url,un)
{

if (un=="") 
alert("你还没有登录");
else
window.open(url, "down", "width=1,height=1,left=0,top=10,scrollbars=yes") ;


}
function tc(url)
{
window.open(url, "listwindow", "width=660,height=650,left=200,top=10,scrollbars=yes") ;

}
function tc2(url)
{
window.open(url, "down", "width=440,height=320,left=200,top=200,scrollbars=yes") ;

}

function vipyz(un)
{
if (un=="")
  {alert("您还没有登录");
return false;
  }
return true;
}