index.html

<!DOCTYPE html>
<html lang="pt-BR">
    <head>
        <meta charset="UTF-8">
        <title>Calculadora Muito Foda</title>

        <style>
            #txt1 {
                color: #FFFFFF;
            }
        </style>
    </head>

    <body style="background-color: #222222">
        <h1 id="txt1">texto foda</h1>
        <input id="b1" type="button" value="links" onclick="openLink(1)">
        <br>
        <input id="b1" type="button" value="draco calc" onclick="openLink(0)">
    </body>


    <script>
        function openLink(arg){
            switch(arg){
                case 0:
                window.location.href = "draco calc.html";
                break
                case 1:
                window.location.href = "links.html";
                break
            }
        }
    </script>
</html>