function show(partName) {
	document.getElementById('index_companies_weurope').style.visibility = 'hidden';
	document.getElementById('index_companies_eeurope').style.visibility = 'hidden';
	document.getElementById('index_companies_africa').style.visibility = 'hidden';
	document.getElementById('index_companies_samerica').style.visibility = 'hidden';
	if(partName != 'none')
		document.getElementById('index_companies_'+partName).style.visibility = 'visible';
}