function tabSwitch(new_tab, new_content) {

document.getElementById('content_1').style.display = 'none';
document.getElementById('content_2').style.display = 'none';
document.getElementById(new_content).style.display = 'block';  
 
document.getElementById('tab_1').className = '';
document.getElementById('tab_2').className = '';
document.getElementById(new_tab).className = 'active';     
 
}