function opennav(objup,obj,menuname){
	menu(1,menuname,'montrer','cacher','div'); menu(1,menuname,'imagecacher','imagevoir','img');
	
	if (objup!='') {
		var td1=document.getElementById(objup+'_1');
		var img=document.getElementById(objup+'_2');
		td1.style.backgroundColor='#DD6703';								
		td1.style.color='#640000';		
		td1.className = 'nav_um_active';
	}			
	var td1=document.getElementById(obj+'_1');
	var img=document.getElementById(obj+'_2');
	td1.style.backgroundColor='#DD6703';								
	td1.style.color='#640000';				
	td1.className = 'nav_active';
	
}