/* cookies.js */
/*
     Example File From "JavaScript and DHTML Cookbook"
     Published by O'Reilly & Associates
     Copyright 2003 Danny Goodman
*/

// utility function to retrieve a future expiration date in proper format;
// pass three integer parameters for the number of days, hours,
// and minutes from now you want the cookie to expire; all three
// parameters required, so use zeros where appropriate
function getExpDate(days, hours, minutes) {
    var expDate = new Date();
    if (typeof days == "number" && typeof hours == "number" && typeof hours == "number") {
        expDate.setDate(expDate.getDate() + parseInt(days));
        expDate.setHours(expDate.getHours() + parseInt(hours));
        expDate.setMinutes(expDate.getMinutes() + parseInt(minutes));
        return expDate.toGMTString();
    }
}

// utility function called by getCookie()
function getCookieVal(offset) {
    var endstr = document.cookie.indexOf (";", offset);
    if (endstr == -1) {
        endstr = document.cookie.length;
    }
    return unescape(document.cookie.substring(offset, endstr));
}

// primary function to retrieve cookie by name
function getCookie(name) {
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    while (i < clen) {
        var j = i + alen;
        if (document.cookie.substring(i, j) == arg) {
            return getCookieVal(j);
        }
        i = document.cookie.indexOf(" ", i) + 1;
        if (i == 0) break; 
    }
    return null;
}

// store cookie value with optional details as needed
function setCookie(name, value, expires, path, domain, secure) {
    document.cookie = name + "=" + escape (value) +
        ((expires) ? "; expires=" + expires : "") +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        ((secure) ? "; secure" : "");
}

// remove the cookie by setting ancient expiration date
function deleteCookie(name,path,domain) {
    if (getCookie(name)) {
        document.cookie = name + "=" +
            ((path) ? "; path=" + path : "") +
            ((domain) ? "; domain=" + domain : "") +
            "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
}

function addCookieItem(prefix,id,status){
	var cur_value = getCookie(prefix);
	var new_value = "";
	var exist = false;
	if(cur_value==null){
		new_value = id + "=" + status;
	}else{
		var items = cur_value.split("&");		
		for(i=0; i<items.length; i++){
			var val = items[i].split("=")[0];
			var stat = items[i].split("=")[1];
			if(val==id){
				new_value = new_value + bit2String(i>0,"&") + id + "=" + status;
				exist = true;
			}else{
				new_value = new_value + bit2String(i>0,"&") + val + "=" + stat;
			}
		}
		if(!exist){
			new_value = new_value + bit2String(items.length>0,"&") + id + "=" + status;
		}
	}
	var myDate=new Date();
	myDate.setDate(myDate.getDate()+1000);
	setCookie(prefix, new_value, myDate);
}

function removeCookieItem(prefix,id){
	var cur_value = getCookie(prefix);
	var items = cur_value.split("&");
	var new_value = "";	
	for(i=0; i<items.length; i++){
		var val = items[i].split("=")[0];
		var stat = items[i].split("=")[1];
		if(val!=id){
			if(new_value.length==0){
				new_value = val + "=" + stat;
			}else{
				new_value = new_value + "&" + val + "=" + stat;
			}	
		}
	}
	var myDate=new Date();
	myDate.setDate(myDate.getDate()+1000);
	setCookie(prefix, new_value, myDate);
}

function bit2String(condition, str){
	if(condition)
		return str;
	else
		return "";
}