//
// JavaScript code (c) 2000 Bert Boer (bert@geenpunt.nl)
//

var ua = navigator;
var ns4 = false;
var ie4 = false;

if (ua.appName == "Netscape") if (ua.appVersion.substr(0, 2) == "4.") ns4 = true;
if (ua.appName == "Microsoft Internet Explorer") if (ua.appVersion.substr(0,2) == "4.") ie4 = true;

function Banner() {
	/* static vars */
	this.loop = 1;        // loop at this position, also number of ads in cycle
	if (this.loop > 1) this.current = Math.round(Math.random() *(this.loop -1) +1);  // start at random position in cycle
	else this.current = 1;
	this.delta = 60 *1000;  // delta time in msecs
	
	this.origin = "http://ad.geenpunt.nl/getad.php3?ident=waobank";
	
	this.name = "";
	this.imgid = 0;
	
	this.utc = 0;
	
	/* member functions */
	this.init = Banner.init;
	this.next = Banner.next;
	this.update = Banner.update;
	this.redirect = Banner.redirect;
}

Banner.init = function(varname, layerid, imgid) {
	/* variable vars */
	this.name = varname;
	if (ns4) {
		if (document.layers[layerid]) {
			this.imgid = document.layers[layerid].document.images[imgid];
			this.formid = document.layers[layerid].document.forms[0];
		}
		else {
			this.imgid = document.images[imgid];
			this.formid = document.forms[0];
		}
	}
	else {
		this.imgid = document.images[imgid];
		this.formid = document.forms[0];
	}
	
	var tmp = new Date();
	var utc = Date.UTC(2000, tmp.getMonth(), tmp.getDate(), tmp.getHours(), tmp.getMinutes(), tmp.getSeconds()) /1000;
	
	this.utc = utc;
	
	this.update();
	
	/* start cycle */
	if (this.loop > 1) setTimeout(this.name +".next()", this.delta);
}

Banner.next = function() {
	this.utc += (this.delta /1000);
	this.current++;
	if (this.current > this.loop) this.current = 1;
	this.update();
	
	setTimeout(this.name +".next()", this.delta);
}

Banner.update = function() {
	this.imgid.src = this.origin +"&id=" +this.current +"&utc=" +this.utc;
}

Banner.redirect = function() {
	this.formid.action = this.origin;
	this.formid.id.value = this.current;
	this.formid.submit();
}

var banner = new Banner();