function getElementsByClass(searchClass,node,tag) {
  var classElements = new Array();
  if (node == null)
    node = document;
  if (tag == null)
    tag = '*';
  var els = node.getElementsByTagName(tag);
  var elsLen = els.length;
  var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
  for (i = 0, j = 0; i < elsLen; i++) {
    if (pattern.test(els[i].className) ) {
      classElements[j] = els[i];
      j++;
    }
  }
  return classElements;
}


 
function show_hide_balise(balise){
 var e=document.getElementsByTagName(balise);
 for(var i=0;i<e.length;i++){
	if (e[i].className!="navigation") {
    vista = (e[i].style.display == 'none') ? 'block' : 'none';
	  e[i].style.display= vista;
	}
 }
}

function show_hide_classe(classe){
 var e=getElementsByClass(classe);
 for(var i=0;i<e.length;i++){
	  vista = (e[i].style.display == 'none') ? 'block' : 'none';
	  e[i].style.display= vista;
 }
 
}