function switch_visibility(ID_div)
{
	zdiv = document.getElementById('choix');
	adiv = document.getElementById('lienrecherche');
	pdiv = document.getElementById('milieusearch');
	if(zdiv.style.display){
		if(zdiv.style.display == "none"){
			zdiv.style.display = "block";
			zdiv.style.height = "100px";
			pdiv.style.height = "150px";
			adiv.className = "lien_fleche_rouge_bas lien_noirgras";
		}else{
			zdiv.style.display = "none";
			zdiv.style.height = "100px";
			pdiv.style.height = "20px";
			adiv.className = "lien_fleche_rouge lien_noirgras";
		}
	}else{
		zdiv.style.display = 'block';
		zdiv.style.height = "100px";
		pdiv.style.height = "150px";
		adiv.className = "lien_fleche_rouge_bas lien_noirgras";
	}
}