// fonction pour le menu gauche

function collapse_expand_sous_menu(menu_id,nav_id){
	if($(menu_id+'_img_'+nav_id).className == "collapsed"){
		$(menu_id+'_img_'+nav_id).className = "expanded";
		$(menu_id+'_ul_'+nav_id).show();
		$(menu_id+'_img_'+nav_id).src = CONF_URL_IMG+"/ico16_round_tree_collapsed.gif";
	}
	else if($(menu_id+'_img_'+nav_id).className == "expanded"){
		$(menu_id+'_ul_'+nav_id).hide();
		$(menu_id+'_img_'+nav_id).className = "collapsed";
		$(menu_id+'_img_'+nav_id).src = CONF_URL_IMG+"/ico16_round_tree_expanded.gif";
	}
}