<script type="text/javascript">
    function sel() {
    switch (document.getElementById("x").value) {
      case "1": x=246000000; break;
      case "2": x=100; break;
      case "3": x=1000; break;
      case "4": x=10000; break;
      case "5": x=100000; break;
      case "6": x=1000000; break;
      case "7": x=10000000; break;
      case "8": x=100000000; break;
    }
    var id = Math.floor(Math.random()*x);
    window.open("http://vk.com/id"+id);
    }
    </script>