function Show(obj)
{
	if(obj)
	{
	var nava = (document.layers);
	var dom = (document.getElementById);
	var iex = (document.all);
	
	if (nava) { cach = document.obj }
	else if (dom) { cach = document.getElementById(obj).style }
	else if (iex) { cach = obj.style }
	
	if(cach.visibility=='hidden' || cach.visibility==''){cach.visibility = 'visible';}
	else												{cach.visibility = 'hidden';}
	}
}

//afficher le paragraphe
function show_parag(IdParag){
	if (document.getElementById("paragraphe"+IdParag).style.display == ""){
		document.getElementById("paragraphe"+IdParag).style.display = 'none';
	} else {
		//cache tous les parag
		hide_all_parag();
		//affiche le paragraphe
		document.getElementById("paragraphe"+IdParag).style.display = '';
	}
}

//cache tous les paragraphes
function hide_all_parag(){	
	for(i=1;i<=7;i++)
  		document.getElementById("paragraphe"+i).style.display = 'none';
}