//Javascript Document 

function makeactive(tab){  
document.getElementById("tab-1").className = ""; 
document.getElementById("tab-2").className = ""; 
document.getElementById("tab-3").className = ""; 
document.getElementById("tab-"+tab).className = "active";

document.getElementById("tab-content-1").className = ""; 
document.getElementById("tab-content-2").className = ""; 
document.getElementById("tab-content-3").className = ""; 
document.getElementById("tab-content-"+tab).className = "active";

}