// first hide all
function start() {
	if (document.getElementById) {	
		document.getElementById('sub1').style.display = 'none';
		document.getElementById('sub2').style.display = 'none';
		document.getElementById('sub3').style.display = 'none';
		document.getElementById('letterbox').style.marginTop = '0px';
	}
}

// show OFFERS
function showoffers() {
if (document.getElementById) { // DOM3 = IE5, NS6
document.getElementById('sub1').style.display = 'block';


document.getElementById('sub2').style.display = 'none';

document.getElementById('sub3').style.display = 'none';

document.getElementById('letterbox').style.marginTop = '290px';
}
else {
if (document.layers) { // Netscape 4
document.hideShow.display = 'block';
}
else { // IE 4
document.all.hideShow.style.display = 'block';
}
}
} 

// show GASTRO
function showmedici() {
if (document.getElementById) { // DOM3 = IE5, NS6
document.getElementById('sub2').style.display = 'block';


document.getElementById('sub1').style.display = 'none';

document.getElementById('sub3').style.display = 'none';

document.getElementById('letterbox').style.marginTop = '142px';

}
else {
if (document.layers) { // Netscape 4
document.hideShow.display = 'block';
}
else { // IE 4
document.all.hideShow.style.display = 'block';
}
}
} 

// show SERVICE
function showservice() {
if (document.getElementById) { // DOM3 = IE5, NS6
document.getElementById('sub3').style.display = 'block';


document.getElementById('sub1').style.display = 'none';

document.getElementById('sub2').style.display = 'none';

document.getElementById('letterbox').style.marginTop = '169px';

}
else {
if (document.layers) { // Netscape 4
document.hideShow.display = 'block';
}
else { // IE 4
document.all.hideShow.style.display = 'block';
}
}
}