function zk(){

tbtype1.style.display = "";


tbtype2.style.display = "";
tbtype3.style.display = "";
}
function ss()
{

tbtype1.style.display = "none";


tbtype2.style.display = "none";
tbtype3.style.display = "none";
}
function showtb(tbnum){whichEl = eval("tbtype" + tbnum);if (whichEl.style.display == "none"){eval("tbtype" + tbnum + ".style.display=\"\";");}else{eval("tbtype" + tbnum + ".style.display=\"none\";");}}