/*hightlight on hp*/
function hide(elt_id){
    document.getElementById('content1').style.display="none";
    document.getElementById('content2').style.display="none";
    document.getElementById('content3').style.display="none";
    document.getElementById('content4').style.display="none";
    
    document.getElementById('content'+elt_id).style.display="block";
    
    document.getElementById('teaser1').className="";
    document.getElementById('teaser2').className="";
    document.getElementById('teaser3').className="";
    document.getElementById('teaser4').className="last";
    document.getElementById('teaser'+elt_id).className+=" active";
}