function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function () {
			if (oldonload) {
				oldonload();
			}
			func();
		}
	}
}

addLoadEvent(function () {
	
	pic = document.getElementById("bilder");
	pics = pic.getElementsByTagName("img");
	
	var rand_no = Math.random();
	rand_no = rand_no * pics.length;
	rand_no = Math.ceil(rand_no);
	j = rand_no;
	
	hide();
})

function hide() {
	for (i = 0; i < pics.length; i++) {
		
		if (i == j) {
			pics[i].style.display = 'inline';
		} else {
			pics[i].style.display = 'none';
			/*pics[i].setAttribute("style","");*/
		}
	}
	if (j == pics.length - 1) {
		j = 0;
	} else {
		j++;
	}
	setTimeout("hide()", 5000);
}