function showMenu(shw, hda, hdb, hdc) {
	var s_ul  = 'ul_'+shw; //Menu a montrer
	var h_ula = 'ul_'+hda; //le reste a masquer
	var h_ulb = 'ul_'+hdb;
	var h_ulc = 'ul_'+hdc;
	
	var s_l  = 'l_'+shw; // lien a montrer
	var h_la  = 'l_'+hda; // lien a montrer
	var h_lb  = 'l_'+hdb; // lien a montrer
	var h_lc  = 'l_'+hdc; // lien a montrer
		
	var elemUL = document.getElementById(s_ul).style;
	var elemL = document.getElementById(s_l).style;
	
		document.getElementById(h_ula).style.display = 'none';
		document.getElementById(h_la).style.background = '';
		
		document.getElementById(h_ulb).style.display = 'none';
		document.getElementById(h_lb).style.background = '';
		
		document.getElementById(h_ulc).style.display = 'none';
		document.getElementById(h_lc).style.background = '';

		elemUL.display = 'block';
		elemL.background = 'url(../_i/menu_barre.jpg)';
}

function PopupCenter(pageURL, title,w,h) {
	var left = (screen.width/2)-(w/2);
	var top = (screen.height/2)-(h/2);
	var targetWin = window.open (pageURL, '', 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=yes, resizable=yes, copyhistory=no, width='+w+', height='+h+', top='+top+', left='+left);
}