function expande(id)
{
	var dossier=document.getElementById('dossier'+id);
	var links=dossier.getElementsByTagName('a');
	links[0].innerHTML='-'+links[0].innerHTML.substr(1);
	links[0].href="javascript:contrai('"+id+"')";
	var lista=dossier.getElementsByTagName('ul')
	lista[0].style.display='block';
}

function contrai(id)
{
	var dossier=document.getElementById('dossier'+id);
	var links=dossier.getElementsByTagName('a');
	links[0].innerHTML='+'+links[0].innerHTML.substr(1);
	links[0].href="javascript:expande('"+id+"')";
	var lista=dossier.getElementsByTagName('ul')
	lista[0].style.display='none';
}