function pop_under(page){
	window.open(page,'pop','toolbar=0,location=0,directories=0,status=0,scrollbars=1,resizable=0,copyhistory=0,menuBar=0,width=30000,height=30000,');
	window.focus();
	pop.blur(); 
}

function popupcentree(page,largeur,hauteur,options){
	var top=(screen.height-hauteur)/2;
	var left=(screen.width-largeur)/2;
	window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
}