function make_hh_tmstmp() {
	var datum = new Date();
	var jahr = datum.getFullYear().toString().substr(2,2);
	var tag = datum.getDay();
	var monat = datum.getMonth() + 1;
	monat = monat.toString();
	if (monat.length == 1)
		monat = '0' + monat;
	
	var tag = datum.getDate().toString();
	if (tag.length == 1)
		tag = '0' + tag;
	
	var hh_tmstmp = jahr + monat + tag;
	return hh_tmstmp;
}

function write_image(target_url, default_image, special_url, special_image, begin, end) {
	//redo of timestamp;
	var datum = new Date();
	var jahr = datum.getFullYear().toString().substr(2,2);
	var tag = datum.getDay();
	var monat = datum.getMonth() + 1;
	monat = monat.toString();
	if (monat.length == 1)
		monat = '0' + monat;
	
	var tag = datum.getDate().toString();
	if (tag.length == 1)
		tag = '0' + tag;
	
	var happy = jahr + monat + tag;
	
	
	//get the hour of the current UTC time to avoid timezone conflicts
	now = new Date().getUTCHours();
	now = now + 1;
	
	//get weekday (0 = Sunday)
	day = new Date().getDay();

	//default image link

	image_url = default_image;
	
	//check time and change image URL
	if (day == 4 && now >= begin && now <= end) {
		
		//override happy hour link happy hour 
		target_url = 'http://www.discount24.de/external.html?HappyHour=' + happy +'&PublicItemID=000000_00104&PPID=00104&cm_mmc=Affiliation-_-Zanox-_-Partner-_-Banner';
		image_url = special_image;
		
		link  = '<a href="' + target_url + '">';
		link += '<img border="0" src="' + image_url +'" alt="Werbemittel" />';
		link += '</a>';
	
		document.write(link);
	
	} else {
		target_url = 'http://www.discount24.de/external.html?PublicItemID=000000_00104&PPID=00104&cm_mmc=Affiliation-_-Zanox-_-Partner-_-Banner';
		link  = '<a href="' + target_url + '">';
		link += '<img border="0" src="' + image_url +'" alt="Werbemittel" />';
		link += '</a>';	
	
		document.write(link);
	}
}