window.addEvent('domready', function(){
 $$('[id^=articolo]').each(function(el){
  new Fx.Slide(el.id).hide('vertical');
 });
});

function showMessage(messageid, elId){
  var myVerticalSlide = new Fx.Slide(messageid);
 if ($(elId).src.indexOf('plus_info.gif') > 0){
  myVerticalSlide.toggle();
  $(elId).src='/images/minus_info.gif';
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  myVerticalSlide.toggle();
  $(elId).src='/images/plus_info.gif';
 }
}