function ShowHide(id,tabid) {
document.getElementById("topic1").style.display = "none";
document.getElementById("topic2").style.display = "none";
document.getElementById(id).style.display  = "";

document.getElementById("tab1").className="tab";
document.getElementById("tab2").className="tab";
document.getElementById(tabid).className="tabSel";
}	

function ShowTab1() {
document.getElementById("tab1").className="tabSel";
document.getElementById("tab2").className="tab";
}