// JavaScript Document


function tabSwitch(new_tab, new_content) {  

document.getElementById('tab_past').style.display = 'none';
document.getElementById('tab_present').style.display = 'none';
document.getElementById('tab_future').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';
}