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 eraseCookie(name) {
	createCookie(name,"",-1);
}
function addToFavorites(pid){

    //alert(pid);
    //alert(readCookie('rntrscart'));
    var s = readCookie('rntrscart');
    var alreadyExists=false;
    
    if(s==null)
      s = pid + '|';
    else {
        
    	var cart = s.split('|');
		for(var i=0;i < cart.length;i++) {
	 
	  	if(cart[i]==pid)
	    	alreadyExists=true;	
		}
    
      	if(!alreadyExists)
        	s = s + pid + '|';     
    }   
    
    //alert('new cookie should be ' + s);  
      
    createCookie('rntrscart',s,30);
    document.getElementById("favs"+pid).innerHTML = 'Added to favorites';  

}