//retorna o dom do Browser
    function domAtual() {        
        if(document.layers) {
             return "layers";
        }
        if(document.all) {
             return "all";
        }
        if(document.getElementById && !document.all){
            return "getElementById";
        }
    }
    
    //retorna a largura total do site
    function areaVisualBrowserW() {
        dom = domAtual();
        
        //IE
        if(dom == "all") {
             return window.document.body.offsetWidth
        }
        //Netscape4
        if(dom == "layers") {
             return window.outerWidth
        }
        //Netscape6 ou +
        if(dom == "getElementById") {
             return window.outerWidth
        }
    }
    
    function areaVisualBrowserH() {
        dom = domAtual();
        
        //IE
        if(dom == "all") {
             return window.document.body.offsetHeight
        }
        //Netscape4
        if(dom == "layers") {
             return window.innerHeight
        }
        //Netscape6 ou +
        if(dom == "getElementById") {
             return window.innerHeight
        }
    }
    
    
    //retorna posição inicial do site no Browser em pixel
    function posicionaLayer(layerId, w, h) {
        dom = domAtual();
        areaVisualW = areaVisualBrowserW();
        areaVisualH = areaVisualBrowserH();
        larguraSite = 778;
        alturaSite = 0;
        y = 0;
        x = 0;
    
        y = (areaVisualH - areaVisualH)/2;
        x = (areaVisualW - larguraSite)/2;
        
        if(dom == "layers") {
            eval("document."+dom+"['"+layerId+"'].top = "+ (y+h) +"");
            eval("document."+dom+"['"+layerId+"'].left = "+ (x+w) +"");
        } else {
            eval("document."+dom+"('"+layerId+"').style.top = "+ (y+h) +"");
            eval("document."+dom+"('"+layerId+"').style.left = "+ (x+w) +"");
        }
    }
	
 function resize() {
  posicionaLayer('menu', 402, 115);
 }