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+"="+escape(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 unescape(c.substring(nameEQ.length,c.length)); 
    } 
    return ""; 
	*/

	var nameOfCookie = name + "=";
	var x = 0;
	while ( x <= document.cookie.length )
	{
		var y = (x+nameOfCookie.length);
		if ( document.cookie.substring( x, y ) == nameOfCookie ) {
		if ( (endOfCookie=document.cookie.indexOf( ";", y )) == -1 )
			endOfCookie = document.cookie.length;
			return unescape( document.cookie.substring( y, endOfCookie ) );
		}
		x = document.cookie.indexOf( " ", x ) + 1;
		if ( x == 0 )
			break;
	}
	return "";
} 
  
function eraseCookie(name) { 
    createCookie(name,"",-1); 
} 
  
function showCookie(name) { 
    alert(readCookie(name)); 
} 
    
function addCookie(name,value,days) { 
    if (readCookie(name) != null) { 
        var oldvalue = readCookie(name); 
        var newvalue = oldvalue+","+value; 
    } 
    else 
    	var newvalue = value; 
    createCookie(name,newvalue,days); 
} 
  
function getHistory(name) { 
    var sHistory = readCookie(name); 
    if(sHistory) { 
        var aHistroy = sHistory.split(","); 
        for (x in aHistroy) 
        { 
            //do something ... 
        } 
    } 
}