lastClientID = 0; function showClient(clientID) { if (lastClientID > 0) { document.getElementById('clientDiv1' + lastClientID).style.display = 'none'; document.getElementById('clientDiv2' + lastClientID).style.display = 'none'; } document.getElementById('clientDiv1' + clientID).style.display = 'inline'; document.getElementById('clientDiv2' + clientID).style.display = 'inline'; lastClientID = clientID; }