//Onload set actives 
    window.activediv = "divintro";
    window.activebutton = "buttonintro";
 
    
    function displaySwitch(newdiv, newbutton) {    
    activediv = window.activediv;
    activebutton = window.activebutton;
    document.getElementById(activediv).style.display="none";
    document.getElementById(newdiv).style.display="block";
    document.getElementById(activebutton).setAttribute("class","nobg");
    document.getElementById(newbutton).setAttribute("class","onpage");
    window.activediv=newdiv;
    window.activebutton=newbutton;
}

function nextPage(){

    var divintro = document.getElementById("divintro").style.display;
    var buttonintro = document.getElementById("buttonintro").style.display;
    
    var div1 = document.getElementById("div1").style.display;
    var button1 = document.getElementById("button1").style.display;
    
    var div2 = document.getElementById("div2").style.display;
    var button2 = document.getElementById("button2").style.display;
    
    var div3 = document.getElementById("div3").style.display;
    var button3 = document.getElementById("button3").style.display;
    
    var div4 = document.getElementById("div4").style.display;
    var button4 = document.getElementById("button4").style.display;
    
    var div5 = document.getElementById("div5").style.display;
    var button5 = document.getElementById("button5").style.display;
    
    if (divintro == "block") {
        displaySwitch("div1", "button1");
    }
    
    if (div1 == "block") {
        displaySwitch("div2", "button2");
    }
    
    if (div2 == "block") {
        displaySwitch("div3", "button3");
    }
    
    if (div3 == "block") {
        displaySwitch("div4", "button4");
    }
    
    if (div4 == "block") {
        displaySwitch("div5", "button5");
    }
    
    if (div5 == "block") {
        displaySwitch("divintro", "buttonintro");
    }
}