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From my point of view, you are using the wrong measurements, take for instance, your body is 1024px; and your side div is 320px; by the time you re-size your browser or views in a smaller resolution,...

function alertD(div){
alert(div.innerHTML);
}

<div onclick="alertD(this);">Blablablablab</div>

widely used script to hide and show

<script language="javascript">
var $=function(id){return document.getElementById(id);}
function toggleDisplay(id){
if($(id).style.display=="block"){...

You need to put your header script to the top of the page.
if the header has already been sent with codes like <!Doctype ... it will be a duplicate

so move it from where it is to the top of the...