function changeClass(elName,cntPictures){
	var el = getE(elName);
	var entries = cntPictures;
	var klasse = "zufall"; 
	if(changeClass.arguments.length>2){
		klasse = changeClass.arguments[2];
		}
	random_number =  Math.ceil(Math.random()*entries)
	el.className+=" " + klasse + "_" + random_number;
	
	switch(random_number){
		case 1:
			el.title = "Oberhalb Pfäffikon, Blick auf den Zürichsee";
			break;
		case 2:
			el.title = "Am See in Pfäffikon";
			break;
		case 3:
			el.title = "Hafen Walenseeli in Bäch";
			break;
		case 4:
			el.title = "Rebbaugebiet Leutschen zwischen Wilen und Freienbach";
			break;
		case 5:
			el.title = "Im Tal in Pfäffikon";
			break;
	}
}
	
addLoadEvent(initRandomClassCustom); 

function initRandomClassCustom(){ 
	changeClass("startbild","5"); 
}