function selectTab(tab){
   document.getElementById("tab-"+currentTab).className="normal";
   document.getElementById("tab-"+tab).className="selected";

   document.getElementById("a-"+currentTab).style.display="block";
   document.getElementById("a-"+tab).style.display="none";

   document.getElementById("span-"+currentTab).style.display="none";
   document.getElementById("span-"+tab).style.display="block";

   displayOFPanel(tab)

   currentTab=tab;
}

function displayOFPanel(tab){
   document.getElementById("OFpanel-"+currentTab).style.display="none";
   document.getElementById("OFpanel-"+tab).style.display="block";
}