function popup(page,nom,largeur,hauteur,options) {
	
    if(largeur == "100%") {
        var top = 0;
        var left = 0;
        largeur = screen.width;
        hauteur = screen.height;
    } else {
        var top=(screen.height-hauteur)/2;
    	var left=(screen.width-largeur)/2;    
    }
	
	window.open(page,nom,"top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
}