function resize(){
	window.locationbar = false;
	window.personalbar = false;
	window.resizeTo(500, 200);
}

function popup(url,nom,w,h){ 
	t=(screen.height - h)/2;
	l=(screen.width - w)/2;
	center=("top="+t+",left="+l+",width="+w+",height="+h+",");
	window.open(url,nom,center);
}