function display_dl(id)
{var element=document.getElementById(id);if(element.style.display=='block')
{element.style.display='none';}
else
{element.style.display='block';}}
function display_dl_liste(id)
{var cells=document.getElementById(id).getElementsByTagName('ul');var element=cells[0];if(element.style.display=='block')
{element.style.display='none';}
else
{element.style.display='block';}}