/* 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 : "; 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";
    }
}