showGroup = function(id) {
	groups = document.getElementById('companies').childNodes;
	for(i in groups) 
		if(groups[i].style)	groups[i].style.display = 'none';
	
	buttons = document.getElementById('industries').childNodes;
	for(i in buttons) 
		if(buttons[i].style)	buttons[i].className = '';
	
	document.getElementById('group'+id).style.display = 'block';
	document.getElementById('button'+id).className = 'active';
}