function changebackground(img) {
  obj = document.getElementById("imageholder");
  if (!img) {
    obj.style.backgroundImage = 'url(test_a.jpg)';
  }
  else {
    obj.style.backgroundImage = 'url('+img+')';
  } 
}

function hoverdescription(pos) {
	obj = document.getElementById("l_souvenirholder");
	if (pos) {
		obj.style.backgroundPosition = "left " + pos + "px";
		//alert(obj.style.backgroundPosition);
	}
	else {
		obj.style.backgroundPosition = "0px bottom";
	}
}

function changebuttonstat(hoverstatus, id) {
  if (id == "menu_tshirts" || id == "menu_souvenirs") {
    if (id == "menu_tshirts") {
      obj = document.getElementById('button_tshirts');
      obj2= document.getElementById('button_tshirts2');
    }
    else if (id == "menu_souvenirs") {
      obj = document.getElementById('button_souvenirs');
      obj2= document.getElementById('button_souvenirs2');
    }
    if (hoverstatus == "in") {
      obj.style.backgroundPosition = 'center bottom';
      obj2.style.backgroundPosition= 'center bottom';
    }
    else {
      obj.style.backgroundPosition = 'center top';
      obj2.style.backgroundPosition= 'center top';
    }    
  }
  else {
    obj = document.getElementById(id);
    if (hoverstatus == "in") {
      obj.style.backgroundPosition = 'center bottom';
    }
    else {
      obj.style.backgroundPosition = 'center top';
    }
  }
}