// Cookie functions

// Copyright Ole Nielsen 2002-2003
// Please read copyright notice in index.html source

// cookie value has format "place='Den Haag'&lat=52.03&lng=4.23&tz=-60&dst=false" (unescaped form)
// placeid is name of cookie (more than just "home" cookie possible)
// dst is true if tz is DST

// search for cookie "placeid" and initialize observer from it if found, else return 'false'
function getCookie(placeid,obs) {
	var place=""; var lat=9999.0; var lng=9999.0; var tz=9999;
	var thisCookie=document.cookie.split("; ");
	if (thisCookie=="") return false;
	for (var i=0; i<thisCookie.length; i++) {
		if (placeid == thisCookie[i].split("=")[0]) {
			var argstr = unescape(thisCookie[i].split("=")[1]);
			var args = argstr.split('&');
			if (args.length<4) return false;
			for (var i=0; i<args.length; i++) eval(args[i]);
		}
	}
	// check if valid values were read
	if (Math.abs(lat)>90.0 || Math.abs(lng)>180.0 || Math.abs(tz)>960) return false;
	obs.name = place;
	obs.latitude = lat;
	obs.longitude = lng;
	obs.tz = tz;
	obs.dst = dst;
//	tbl.Place.options[0].selected=true;
	rewritePlace();
	rewrite2();
	// rewrite cookie to refresh expire date
	setCookie(placeid,obs);
	return true;
}


// remember observatory in cookie 
function setCookie(placeid,obs) {
	var expireDate=new Date;
	expireDate.setFullYear(expireDate.getFullYear()+2);
	var argstr="place='"+obs.name+"'&lat="+obs.latitude+"&lng="+obs.longitude+"&tz="+obs.tz+"&dst="+obs.dst;
	document.cookie=placeid+"="+escape(argstr)+"; expires="+expireDate.toGMTString();
}


function deleteCookie(placeid) {
	var expireDate=new Date;
	expireDate.setFullYear(expireDate.getFullYear()-1);
	document.cookie=placeid+"=; expires="+expireDate.toGMTString();
}