javascript
var cookies = 0;
var fires = 0;
var cursors = 0;
var caves = 0;

document.getElementById("1").style.visibility = "hidden";
document.getElementById("1.1").style.visibility = "hidden";
document.getElementById("2").style.visibility = "hidden";
document.getElementById("3").style.visibility = "hidden";


function cookieClick(number){
    cookies = cookies + number;
    document.getElementById("cookies").innerHTML = cookies;
};
function fireClick(number){
    fires = fires + number;
    document.getElementById("fires").innerHTML = fires;
};




function buyCursor(){
    var cursorCost = Math.floor(10 * Math.pow(1.1,cursors));     //works out the cost of this cursor
    if(cookies >= cursorCost){                                   //checks that the player can afford the cursor
        cursors = cursors + 1;                                   //increases number of cursors
    	cookies = cookies - cursorCost;                          //removes the cookies spent
        document.getElementById('cursors').innerHTML = cursors;  //updates the number of cursors for the user
        document.getElementById('cookies').innerHTML = cookies;  //updates the number of cookies for the user
        document.getElementById("1").style.visibility = "visible";

    };
    var nextCost = Math.floor(10 * Math.pow(1.1,cursors));       //works out the cost of the next cursor
    document.getElementById('cursorCost').innerHTML = nextCost;  //updates the cursor cost for the user
};

function buyCave(){
    var caveCost = Math.floor(10 * Math.pow(1.1,caves));     //works out the cost of this cursor
    if(cookies >= caveCost){                                   //checks that the player can afford the cursor
        caves = caves + 1;                                   //increases number of cursors
    	cookies = cookies - caveCost;                          //removes the cookies spent
        document.getElementById('caves').innerHTML = caves;  //updates the number of cursors for the user
        document.getElementById('cookies').innerHTML = cookies;
        document.getElementById("1.1").style.visibility = "visible";
        document.getElementById("2").style.visibility = "visible"; //makes update 1 visible

    };
    var nextCost = Math.floor(10 * Math.pow(1.1,caves));       //works out the cost of the next cursor
    document.getElementById('caveCost').innerHTML = nextCost;  //updates the cursor cost for the user
};

function fireUp(){
    if (cookies >= 1){
     document.getElementById("3").style.visibility = "visible";
    };
};

function buyFire(){
    var fireCost = Math.floor(10 * Math.pow(1.1,fires));     //works out the cost of this cursor
    if(cookies >= fireCost){                                   //checks that the player can afford the cursor
        fires = fires + 1;                                   //increases number of cursors
    	cookies = cookies - fireCost;                          //removes the cookies spent
        document.getElementById('fires').innerHTML = fires;  //updates the number of cursors for the user
        document.getElementById('cookies').innerHTML = cookies;


    };
    var nextCost = Math.floor(10 * Math.pow(1.1,fires));       //works out the cost of the next cursor
    document.getElementById('fireCost').innerHTML = nextCost;  //updates the cursor cost for the user
};


        window.setInterval(function(){
    cookieClick(caves);
}, 900);
        window.setInterval(function(){

	cookieClick(cursors);

}, 1000);
         var cookies = 0;
var fires = 0;
var cursors = 0;
var caves = 0;

document.getElementById("1").style.visibility = "hidden";
document.getElementById("1.1").style.visibility = "hidden";
document.getElementById("2").style.visibility = "hidden";
document.getElementById("3").style.visibility = "hidden";


function cookieClick(number){
    cookies = cookies + number;
    document.getElementById("cookies").innerHTML = cookies;
};
function fireClick(number){
    fires = fires + number;
    document.getElementById("fires").innerHTML = fires;
};




function buyCursor(){
    var cursorCost = Math.floor(10 * Math.pow(1.1,cursors));     //works out the cost of this cursor
    if(cookies >= cursorCost){                                   //checks that the player can afford the cursor
        cursors = cursors + 1;                                   //increases number of cursors
    	cookies = cookies - cursorCost;                          //removes the cookies spent
        document.getElementById('cursors').innerHTML = cursors;  //updates the number of cursors for the user
        document.getElementById('cookies').innerHTML = cookies;  //updates the number of cookies for the user
        document.getElementById("1").style.visibility = "visible";

    };
    var nextCost = Math.floor(10 * Math.pow(1.1,cursors));       //works out the cost of the next cursor
    document.getElementById('cursorCost').innerHTML = nextCost;  //updates the cursor cost for the user
};

function buyCave(){
    var caveCost = Math.floor(10 * Math.pow(1.1,caves));     //works out the cost of this cursor
    if(cookies >= caveCost){                                   //checks that the player can afford the cursor
        caves = caves + 1;                                   //increases number of cursors
    	cookies = cookies - caveCost;                          //removes the cookies spent
        document.getElementById('caves').innerHTML = caves;  //updates the number of cursors for the user
        document.getElementById('cookies').innerHTML = cookies;
        document.getElementById("1.1").style.visibility = "visible";
        document.getElementById("2").style.visibility = "visible"; //makes update 1 visible

    };
    var nextCost = Math.floor(10 * Math.pow(1.1,caves));       //works out the cost of the next cursor
    document.getElementById('caveCost').innerHTML = nextCost;  //updates the cursor cost for the user
};

function fireUp(){
    if (cookies >= 1){
     document.getElementById("3").style.visibility = "visible";
    };
};

function buyFire(){
    var fireCost = Math.floor(10 * Math.pow(1.1,fires));     //works out the cost of this cursor
    if(cookies >= fireCost){                                   //checks that the player can afford the cursor
        fires = fires + 1;                                   //increases number of cursors
    	cookies = cookies - fireCost;                          //removes the cookies spent
        document.getElementById('fires').innerHTML = fires;  //updates the number of cursors for the user
        document.getElementById('cookies').innerHTML = cookies;


    };
    var nextCost = Math.floor(10 * Math.pow(1.1,fires));       //works out the cost of the next cursor
    document.getElementById('fireCost').innerHTML = nextCost;  //updates the cursor cost for the user
};


        window.setInterval(function(){
    cookieClick(caves);
}, 900);
        window.setInterval(function(){

	cookieClick(cursors);

}, 1000);
         window.setInterval(function(){
     fireClick(fires);
 }, 1200);


html
<html>
	<head>
		<link rel="stylesheet" type="text/css" href="main.css" />
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
	</head>
    <body>

    <div class=col-xs-3>
       <span id="2">
           <center>
               Технологии
               		<br />
               <button onclick="fireUp(1)">Приручение огня</button>
               <br />
           </center>
           </span>
</div>

        	<div class=col-xs-6>

		<center><button onclick="cookieClick(1)">Человек</button>
		<br />

		Население: <span id="cookies">0</span>
		<br />

		<button onclick="buyCursor()">Buy Cursor</button>
		<br />

		Cursors: <span id="cursors">0</span>
		<br />

		Cursor Cost: <span id="cursorCost">10</span>
		<br />



        <span id="1">

		<button onclick="buyCave()">Найти пещеру</button>
		<br />

		Caves: <span id="caves">0</span>
		<br />

		Cave Cost: <span id="caveCost">10</span>
		</span>
        <br />
            <span id="1.1">Люди замерзают, необходимы костры</span>
        </center>

    </div>
            <div class=col-xs-3>
                <span id="3">
                    Постройки
                <br />
                    <button onclick="fireClick(1)">Костер</button>
        		<br />
Костров: <span id="fires">0</span>
		<br />
                                   <button onclick="buyFire()">Разводитель костров</button>
<br />
                    <span id="fireCost">10</span>
                </span>
        </div>





        <script type="text/javascript" src="main.js"></script>
	</body>
</html>