OPえｎ

http://kachibito.net/snippets/side-panel-slide

#panel
{
     height: 600px;
     width: 200px;
    padding:20px;
     background: #eee;
     float: left;
     display: none;    
     color: #666;
     font-size: xx-large;
}
.open
{
     height: 20px;
     width: 70px;
     background: #666;
    padding:20px;
     float: left; 
     margin-top: 200px;
    color:#fff;
}

Hello

Open