browserName = navigator.appName;
  browserVer = parseInt(navigator.appVersion);

  if ((browserName == "Netscape" && browserVer >= 3) || browserVer >= 4) 
    versao ="n3";
  else 
    versao = "n2";
  
  if (versao == "n3") {

    menu1 = new Image;
    menu1.src = "images/eng/menu1.gif";
    menu1o = new Image;
    menu1o.src = "images/eng/menu1o.gif";

    menu2 = new Image;
    menu2.src = "images/eng/menu2.gif";
    menu2o = new Image;
    menu2o.src = "images/eng/menu2o.gif";

    menu3 = new Image;
    menu3.src = "images/eng/menu3.gif";
    menu3o = new Image;
    menu3o.src = "images/eng/menu3o.gif";

    menu4 = new Image;
    menu4.src = "images/eng/menu4.gif";
    menu4o = new Image;
    menu4o.src = "images/eng/menu4o.gif";

    menu5 = new Image;
    menu5.src = "images/eng/menu5.gif";
    menu5o = new Image;
    menu5o.src = "images/eng/menu5o.gif";

    menuissues = new Image;
    menuissues.src = "images/eng/menuissues.gif";
    menuissueso = new Image;
    menuissueso.src = "images/eng/menuissueso.gif";

    menuabout = new Image;
    menuabout.src = "images/eng/menuabout.gif";
    menuabouto = new Image;
    menuabouto.src = "images/eng/menuabouto.gif";

    menunews = new Image;
    menunews.src = "images/eng/menunews.gif";
    menunewso = new Image;
    menunewso.src = "images/eng/menunewso.gif";

    menusearch = new Image;
    menusearch.src = "images/eng/menusearch.gif";
    menusearcho = new Image;
    menusearcho.src = "images/eng/menusearcho.gif";

    menucall = new Image;
    menucall.src = "images/eng/menucall.gif";
    menucallo = new Image;
    menucallo.src = "images/eng/menucallo.gif";

    menusub = new Image;
    menusub.src = "images/eng/menusub.gif";
    menusubo = new Image;
    menusubo.src = "images/eng/menusubo.gif";
}

	  function op(Name,Img) {
    if (versao == "n3")
		document.images[Name].src = eval(Img + ".src")
       }
	   
function ma_janela(url,largura,altura,scrollflag,janela)
{
	var posicaoX = screen.width - largura;
	var posicaoY = screen.height - altura;
	if(posicaoX != 0)
	{
		posicaoX = Math.round(posicaoX / 2);
		posicaoY = Math.round(posicaoY / 2);
	}
	pop = window.open(url,janela,"toolbar=no,location=no,address=no,directories=no,status=no,menubar=no,scrollbars="+scrollflag+",resizable=no,copyhistory=yes,maximized=yes,width="+largura+",height="+altura+",left="+posicaoX+",top="+posicaoY);
}

function echeck(str) {

	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
	   //alert("E-mail inválido!")
	   return false
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	   //alert("E-mail inválido!")
	   return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
	    //alert("E-mail inválido!")
	    return false
	}

	 if (str.indexOf(at,(lat+1))!=-1){
	    //alert("E-mail inválido!")
	    return false
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
	    //alert("E-mail inválido!")
	    return false
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
	    //alert("E-mail inválido!")
	    return false
	 }
	
	 if (str.indexOf(" ")!=-1){
	    //alert("E-mail inválido!")
	    return false
	 }

		 return true					
}

function checkSub() {
	var meu_erro = 1;
	
	if (document.formsub.signup_name.value == "") {
		alert("Please enter your name.");
		meu_erro = 2;
		return false;
	}
	
	if (document.formsub.signup_email.value == "") {
		alert("Please enter your e-mail.");
		meu_erro = 2;
		return false;
	}
		
	if (echeck(document.formsub.signup_email.value) != true) {
		alert("Please enter a valid e-mail.");
		meu_erro = 2;
		return false;
	}
	
	if (meu_erro == 1) {
		formsub.action="index.php" 
		formsub.submit();
		return true;
	}
}