function ShowrankTab(id_num,num){
for(var i=0;i<5;i++)
{
var tap=document.getElementById("rankTab_"+id_num+i);
if(tap!=null)
{
tap.className="rankTabOff"
}
}
for(var i=0;i<5;i++){
var tap=document.getElementById("rankCon_"+id_num+i);
if(tap!=null)
{
tap.style.display="none"
}
}
document.getElementById("rankTab_"+id_num+num).className="rankTabOn";
document.getElementById("rankCon_"+id_num+num).style.display="block";
}

function checkForm()
{
var errorMess="";
if(document.doublecombo.tbName.value=="")
{
errorMess=errorMess+"名字不能为空\n\n";
}
if(document.doublecombo.tbPass.value=="")
{
errorMess=errorMess+"密码不能为空";
}
if(errorMess!="")
{
alert(errorMess);
return false;
}
else
return true;
}