window.onload = function() {
  if (navigator.product=="Gecko" && navigator.userAgent.indexOf("rv:1.7")>=-1) { // blad w Gecko 1.7
    var s=document.body.style;
    s.display="none";
    s.display="";
  }
}

function showSubmenu(nazwa)
{
    if(document.getElementById(nazwa))
    {
	if(document.getElementById(nazwa).style.display == 'block')
	document.getElementById(nazwa).style.display="none";
	else
	document.getElementById(nazwa).style.display="block";
    }
}

function w_popup(href,h,w)
{
    var ziel = 'popup';
    var xx = (screen.width-w)/2;
    var yy = (screen.height-h)/2;
    if(cx_win = window.open(href,ziel,"left="+xx+",top="+yy+",screenX="+xx+",screenY="+yy+",width="+w+",height="+h+",toolbar=no,status=no,scrollbars=yes,resizable=yes"))
    {
        cx_win.window.moveTo(xx,yy);
        cx_win.focus();
    }
    else
    {
        return true;	
    }
    return false;
}