The control block in the middle is actually an iframe, and its width is defined as 10.
Then in his internal js, control the left and right 2 iframes.
function switchSysBar(){
if (parent.document.getElementById('attachucp').cols=="160,10,*"){
document.getElementById('leftbar' ).style.display="";
parent.document.getElementById('attachucp').cols="0,10,*";
}
else{
parent.document.getElementById ('attachucp').cols="160,10,*";
document.getElementById('leftbar').style.display="none"
}
}
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