function swapText(id) { 
document.getElementById('text0').className="hide";
document.getElementById('text4').className="hide";
document.getElementById(id).className="show";
}

function swapBack() {
document.getElementById('text1').className="hide";
document.getElementById('text2').className="hide";
document.getElementById('text3').className="hide";
document.getElementById('text4').className="hide";
document.getElementById('text0').className="show";
}