// JavaScript Document

//utility function to retrieve an expiration date in properformat;
//pass three integer parameters for the number of days, hours and minutes from now the cookie will expire. (negative values for a past date)
//all 3 parameters are required, use zeros where appropriate

function getExpDate(days, hours, minutes){
	var expDate = new Date();
	if(typeof days == 'number' && typeof hours == 'number' && typeof minutes == '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 "";
}

//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 an old exp 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";
	}
}