popup = function (url, w, h) {
	if (url) {
		w = (!isNaN(w)) ? w : 650;
		h = (!isNaN(h)) ? h : 600;
		var win = window.open(url, "", "width=" + w + ",height=" + h + ",left=20,top=20,resizable=1,status=1");
		return win;
	}
	return false;
}

function saveCookie(name,value, minutes) {
	if (minutes) {
		var date=new Date();
		date.setTime(date.getTime()+(minutes*60*1000))
		var expires="; expires="+date.toGMTString()
	} else expires=""
	document.cookie=name+"="+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 c.substring(nameEQ.length,c.length)
	}
	return null
}

function bannerPopup(url, w, h, name, expiration) {
	var videl = readCookie(name);

	//debug
	//videl = false;
	if (videl != 'saw') {
		if(expiration> 0) {
			saveCookie(name, 'saw', expiration);
		}
		popup(url, w, h);
	}
}