function sizeMain()
{
    var nSize;
    //definition de la taille du body
    nSize = document.body.offsetHeight;
    nTest = 940;
    //Reduction de la taille en enlevant le titre/flash, le pied
    nSize = nSize-document.getElementById('tdflash').offsetHeight-document.getElementById('tdfoot').offsetHeight;

    document.getElementById('tdcontent').style.height=nSize+"px";

    var totalHeight = document.getElementById('tdlogo').offsetHeight + document.getElementById('tdmenu').offsetHeight + document.getElementById('tdfoot').offsetHeight;
    document.getElementById('tdleft').style.height = totalHeight+"px";
    document.getElementById('tdright').style.height = totalHeight+"px";
}