function createCookie(name,value,days) {
	 if (days) {
	 	var date = new Date();
	 	date.setTime(date.getTime()+(days*24*60*60*1000));
	 	var expires = "; expires="+date.toGMTString();
	 }
	 else var expires = "";
	 
	 document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
  		var c = ca[i];
  		while (c.charAt(0)==' ') c = c.substring(1,c.length);
  		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
 	}
 	return null;
}

function randImage(maxi){	
	var max_img = maxi || 2;

	if (readCookie("home_img") == null) {		
		createCookie("home_img","1");	
	}	
	else {
		if (readCookie("home_img") >= max_img) {
			createCookie("home_img",1);
		}
		else {
			createCookie("home_img",parseInt(readCookie("home_img"))+1);
		}
	}
	document.getElementById('rimg').innerHTML = "<img src='images/banniere/" + readCookie("home_img") + ".jpg' width=674 height=262 alt='montage'>";
}