Javascript Menu Like JQuery Mobile

I'm working with Firefox OS, on customer requirements I can not use frameworks for JavaScript (like JQuery), ie everything must be html, css and JS. I have to do the pull-down menu

Solution 1:

A basic way of doing this is to create a div box (page) and set a z-index lower than the main page so its always behind the main page. Then using css you can move the main page up and down to reveal the page behind.

CSS

#page {
    z-index: 999;
    width:100%;
    height:100%;
    background-color:white;
    position:fixed;
    top:0;
    left: 0;
    -webkit-transition: all .5s ease;
}

.box {
    position:fixed;
    top:0;
    left: 0;
    height:100%;
    background-image: linear-gradient(#ddd, #ccc);
    width: 100%;
    display: block;
    z-index:1;
}

.move {
    top: 0em;
    margin-top:10em;
}
.moveb {
    top: 0em;
    margin-top:0em;
}

JavaScript

function doMove() {
 var element = document.getElementById("page");
 element.classList.remove("move");
 element.classList.remove("moveb");
 element.classList.add("move");
}

function doMoveb() {
 var element = document.getElementById("page");
 element.classList.remove("move");
 element.classList.remove("moveb");
 element.classList.add("moveb");
}      

Demo

http://jsfiddle.net/cut3y0sq/