function tabSwitch(new_tab, new_content) {  
  
    document.getElementById('content-1').style.display = 'none';  
    document.getElementById('content-2').style.display = 'none';  
    document.getElementById('content-3').style.display = 'none';  
    document.getElementById(new_content).style.display = 'block';     
  
    document.getElementById('tab-1').className = '';  
    document.getElementById('tab-2').className = '';  
    document.getElementById('tab-3').className = '';  
    document.getElementById(new_tab).className = 'active';        
  
}