function showtopic(){
 document.getElementById("topics").style.display = "inline";
 document.getElementById("tbig").style.display = "none";
 document.getElementById("tsmall").style.display = "inline";
}

function hidetopic(){
 document.getElementById("topics").style.display = "none";
 document.getElementById("tbig").style.display = "inline";
 document.getElementById("tsmall").style.display = "none";
}

function killtopic(){
 document.getElementById("topics").style.display = "none";
}