function Navigateur(){
  if (navigator.appName.indexOf("Netscape") > -1) {return "Netscape";}
  if (navigator.appName.indexOf("Explorer") > -1) {
	  if (navigator.appVersion.indexOf("MSIE 6.0") > -1) {return "Explorer6";}
	  if (navigator.appVersion.indexOf("MSIE 7.0") > -1) {return "Explorer7";}
  }
  return "Unknown";
}

function ImageRoll(s) {
	return s.replace(".png", "_roll.png");
}
function ImageSansRoll(s) {
	return s.replace("_roll.png", ".png");
}