var theImages = new Array();

theImages[0] = 'images/wallpaper2.jpg';
theImages[1] = 'images/wallpaper3.jpg';
theImages[2] = 'images/wp_gruende.jpg';
theImages[3] = 'images/wp_buecher.jpg';

var p = theImages.length;
var whichImage = Math.round(Math.random()*(p-1));

function rnd_wallpaper(BaseUrl) {
	document.getElementById("header_img").style.backgroundImage = "url(" + BaseUrl + theImages[whichImage] + ")";
}

function html_entity_decode(str) {
  var ta=document.createElement("textarea");
  ta.innerHTML=str.replace(/</g,"&lt;").replace(/>/g,"&gt;");
  return ta.value;
}

function make_tweet_text(str) {
	var ret;
	
	if (str.length < 99) {
		ret = str + " (via @campusgruen_hh)";
	} else {
		ret = str;
	}
	
	return ret;
}