slide right

HTML

<div class="container">
    <div class="slider"></div> 
    <div class="trigger"></div>   
</div>

CSS

.container {
    display: inline-block;
    width: 100%;
    height: 100%;
}
.trigger {
    width: 50px;
    height:50px;
    background-color: blue;
    float:right;
}
.slider {
    width: 200px;
    height:50px;
    background-color: red;
    float:right;
}

JavaScript

function div_out() {
    $('.slider').animate({width: 0}, {duration: 500});
    $('.trigger').one('click', div_in);
}
function div_in() {
    $('.slider').animate({width: 200}, {duration: 500});
    $('.trigger').one("click", div_out);
}
$('.trigger').one('click', div_in);