var sirka_obrazu = 800;
var zacatek = 61;
var stranka;
window.onload = function()
{
sirka_obrazu = screen.width;  /**** vypocet umisteni ma obrazovce ***/
    zacatek = ((sirka_obrazu - 1001) / 2) - 11;
  /*  document.all.page.style.pixelLeft = zacatek;*/
   stranka = document.getElementById("page");
   stranka.style.left = zacatek + "px";
    if (document.all&&document.getElementById) {
        navRoot = document.getElementById("mainMenu");
        for (i=0; i<navRoot.childNodes.length; i++) {
            node = navRoot.childNodes[i];
            if (node.nodeName=="LI") {
                node.onmouseover=function() {
                    this.className+=" over";
                }
                node.onmouseout=function() {
                    this.className=this.className.replace(" over", "");
                }
           }
        }
     }
}