function setfooterhp() {
	var gaucheHeight=document.getElementById('gauche').offsetHeight;
	var centreHeight=document.getElementById('droite').offsetHeight;
	var heightGDMax = Math.max(centreHeight, gaucheHeight);
	
	document.getElementById('cont_hp').style.height=(heightGDMax)+'px';
	document.getElementById('pre-footer-hp').style.top=(heightGDMax)+'px';
	document.getElementById('footer-hp').style.top=(heightGDMax)+'px';
}