<!-- Onload event
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent(showgallery);
addLoadEvent(show);
addLoadEvent(function() { 
});
<!-- Meniu 
function show(id) {
var d = document.getElementById(id); 
	for (var i = 1; i<=10; i++) {
		if (document.getElementById('meniu'+i)) {document.getElementById('meniu'+i).style.display='none';}
	}
if (d) {d.style.display='block';}
}
<!-- Galerie
function showgallery(id) {
var	e = document.getElementById(id);
	for (var j = 1; j<=50; j++) {
		if (document.getElementById('galerie'+j)) {document.getElementById('galerie'+j).style.display='none';}
	}
if (e) {e.style.display='block';}
}
// -->

<!-- Up buton
if (document.images) {
imagesuson = new Image();
imagesuson.src = "../img/sus_a.gif";
imagesusoff = new Image();
imagesusoff.src = "../img/sus_s.gif";
} 
function changeImages() {
if (document.images) {
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
}}} 
// -->