function showDiv1() { 
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById('hs1').style.visibility = 'visible'; 
document.getElementById('hs2').style.visibility = 'hidden';
document.getElementById('hs3').style.visibility = 'hidden';
document.getElementById('hs4').style.visibility = 'hidden';

document.getElementById('ytv1').style.visibility = 'visible'; 
document.getElementById('ytv2').style.visibility = 'hidden';
document.getElementById('ytv3').style.visibility = 'hidden';
document.getElementById('ytv4').style.visibility = 'hidden';
} else { 
if (document.layers) { // Netscape 4 
document.hs1.visibility = 'visible'; 
document.hs2.visibility = 'hidden';
document.hs3.visibility = 'hidden';
document.hs4.visibility = 'hidden';

document.ytv1.visibility = 'visible'; 
document.ytv2.visibility = 'hidden';
document.ytv3.visibility = 'hidden';
document.ytv4.visibility = 'hidden';
} else { // IE 4 
document.all.hs1.style.visibility = 'visible'; 
document.all.hs2.style.visibility = 'hidden';
document.all.hs3.style.visibility = 'hidden';
document.all.hs4.style.visibility = 'hidden';

document.all.ytv1.style.visibility = 'visible'; 
document.all.ytv2.style.visibility = 'hidden';
document.all.ytv3.style.visibility = 'hidden';
document.all.ytv4.style.visibility = 'hidden';
} } } 

function showDiv2() { 
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById('hs1').style.visibility = 'hidden'; 
document.getElementById('hs2').style.visibility = 'visible';
document.getElementById('hs3').style.visibility = 'hidden';
document.getElementById('hs4').style.visibility = 'hidden';

document.getElementById('ytv1').style.visibility = 'hidden'; 
document.getElementById('ytv2').style.visibility = 'visible';
document.getElementById('ytv3').style.visibility = 'hidden';
document.getElementById('ytv4').style.visibility = 'hidden';
} else { 
if (document.layers) { // Netscape 4 
document.hs1.visibility = 'hidden'; 
document.hs2.visibility = 'visible';
document.hs3.visibility = 'hidden';
document.hs4.visibility = 'hidden';

document.ytv1.visibility = 'hidden'; 
document.ytv2.visibility = 'visible';
document.ytv3.visibility = 'hidden';
document.ytv4.visibility = 'hidden';
} else { // IE 4 
document.all.hs1.style.visibility = 'hidden'; 
document.all.hs2.style.visibility = 'visible';
document.all.hs3.style.visibility = 'hidden';
document.all.hs4.style.visibility = 'hidden';

document.all.ytv1.style.visibility = 'hidden'; 
document.all.ytv2.style.visibility = 'visible';
document.all.ytv3.style.visibility = 'hidden';
document.all.ytv4.style.visibility = 'hidden';
} } }

function showDiv3() { 
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById('hs1').style.visibility = 'hidden'; 
document.getElementById('hs2').style.visibility = 'hidden';
document.getElementById('hs3').style.visibility = 'visible';
document.getElementById('hs4').style.visibility = 'hidden';

document.getElementById('ytv1').style.visibility = 'hidden'; 
document.getElementById('ytv2').style.visibility = 'hidden';
document.getElementById('ytv3').style.visibility = 'visible';
document.getElementById('ytv4').style.visibility = 'hidden';
} else { 
if (document.layers) { // Netscape 4 
document.hs1.visibility = 'hidden'; 
document.hs2.visibility = 'hidden';
document.hs3.visibility = 'visible';
document.hs4.visibility = 'hidden';

document.ytv1.visibility = 'hidden'; 
document.ytv2.visibility = 'hidden';
document.ytv3.visibility = 'visible';
document.ytv4.visibility = 'hidden';
} else { // IE 4 
document.all.hs1.style.visibility = 'hidden'; 
document.all.hs2.style.visibility = 'hidden';
document.all.hs3.style.visibility = 'visible';
document.all.hs4.style.visibility = 'hidden';

document.all.ytv1.style.visibility = 'hidden'; 
document.all.ytv2.style.visibility = 'hidden';
document.all.ytv3.style.visibility = 'visible';
document.all.ytv4.style.visibility = 'hidden';
} } }

function showDiv4() { 
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById('hs1').style.visibility = 'hidden'; 
document.getElementById('hs2').style.visibility = 'hidden';
document.getElementById('hs3').style.visibility = 'hidden';
document.getElementById('hs4').style.visibility = 'visible';

document.getElementById('ytv1').style.visibility = 'hidden'; 
document.getElementById('ytv2').style.visibility = 'hidden';
document.getElementById('ytv3').style.visibility = 'hidden';
document.getElementById('ytv4').style.visibility = 'visible';
} else { 
if (document.layers) { // Netscape 4 
document.hs1.visibility = 'hidden'; 
document.hs2.visibility = 'hidden';
document.hs3.visibility = 'hidden';
document.hs4.visibility = 'visible';

document.ytv1.visibility = 'hidden'; 
document.ytv2.visibility = 'hidden';
document.ytv3.visibility = 'hidden';
document.ytv4.visibility = 'visible';
} else { // IE 4 
document.all.hs1.style.visibility = 'hidden'; 
document.all.hs2.style.visibility = 'hidden';
document.all.hs3.style.visibility = 'hidden';
document.all.hs4.style.visibility = 'visible';

document.all.ytv1.style.visibility = 'hidden'; 
document.all.ytv2.style.visibility = 'hidden';
document.all.ytv3.style.visibility = 'hidden';
document.all.ytv4.style.visibility = 'visible';
} } }





function showDAL() { 
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById('dal').style.visibility = 'visible'; 
document.getElementById('ftw').style.visibility = 'hidden';
clearInterval(intervalID);
} else { 
if (document.layers) { // Netscape 4 
document.dal.visibility = 'visible'; 
document.ftw.visibility = 'hidden';

} else { // IE 4 
document.all.dal.style.visibility = 'visible'; 
document.all.ftw.style.visibility = 'hidden';
} } }

function showFTW() { 
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById('dal').style.visibility = 'hidden'; 
document.getElementById('ftw').style.visibility = 'visible';
clearInterval(intervalID);
} else { 
if (document.layers) { // Netscape 4 
document.dal.visibility = 'hidden'; 
document.ftw.visibility = 'visible';

} else { // IE 4 
document.all.dal.style.visibility = 'hidden'; 
document.all.ftw.style.visibility = 'visible';
} } }