String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/, '');
}

function init_logo() {
	function pad(n){return n<10 ? '0'+n : n}
	var data = new Date();
	var md = pad(data.getMonth()+1) + '' + pad(data.getDate());
	var ymd = data.getFullYear() + '' + pad(data.getMonth()+1) + '' + pad(data.getDate());

	if (ymd <= '20100418') {
		document.getElementById('logo').src = '/img/logo_dzistv_zaloba.gif';
	}
	if (md >= '0502' && md <= '0503') {
		document.getElementById('logo').src = '/img/logo_dzistv_maj.gif';
	}
	if (md == '0526') {
		document.getElementById('logo').src = '/img/logo_dzistv_dzienmatki.gif';
	}
	if (ymd == '20100611' || ymd == '20100612' || ymd == '20100711') {
		document.getElementById('logo').src = '/img/logo_dzistv_mundial.gif';
	}
	if (md >= '1031' && md <= '1101') {
		document.getElementById('logo').src = '/img/logo_dzistv_znicze.gif';
	}
	if (md >= '1222' || md <= '0108') {
		document.getElementById('logo').src = '/img/logo_dzistv_swieta.gif';
	}
}

document.observe("dom:loaded", init_logo);