position: fixed;
right: 0;
top: 50%;
Edit: try pasting this div as the first child<div id="content">...
<div class="right-tab">TEXT</div>
CSS
.right-tab {
position: fixed;
top: 50%;
width: 1100px;
background-color: red;
text-align: right;
}
That should get you started. The width will determine how much past content you want to display on the tab (so in this case it is about 100 pixels). The red background is just so you can more easily see the div.
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