function deplier_theme(numero) {
	
	var nom_div_st = 'conteneur_st_'+numero;
	document.getElementById(nom_div_st).style.display = 'block';
	
	var nom_div_t = 'theme_'+numero;
	document.getElementById(nom_div_t).style.background = 'url(./images/theme'+numero+'_on.jpg)';
}

function replier_theme(numero) {

	var nom_div_st = 'conteneur_st_'+numero;
	document.getElementById(nom_div_st).style.display = 'none';
	
	var nom_div_t = 'theme_'+numero;
	document.getElementById(nom_div_t).style.background = 'url(./images/theme'+numero+'_off.jpg)';
}