var $currElement = $("#egy");
$("#gomb").click(function(){
    if(!$currElement.next('div').length){
        alert("Nincs elem!");
        return false;   
    }
    $currElement = $currElement.next();
    $("div").css("background", "");
    $currElement.css("background", "blue");
});
$("#reset").click(function () {
      location.reload();
});