function handleClientsButtons(button, enabled) {
 if (button == "clients_left") {
	$('clients_left').className = enabled ? '' : 'disabled';
 }
 else {
	$('clients_right').className = enabled ? '' : 'disabled';
 }
   
}

function handleServiceButtons(button, enabled) {
 if (button == "service_left") {
	$('service_left').className = enabled ? '' : 'disabled';
 }
 else {
	$('service_right').className = enabled ? '' : 'disabled';
 }
   
}