function show_box(elm){
	var txt = document.getElementById("besked").value.split(/\n/);
	var count = (txt.length-3)
	if(count < 0)
		count = 0;
	var size = 240 +(count*17);
	if(size > (screen.height-300))
		size = (screen.height-350);
	
	Shadowbox.open({
		player: "html",
		title: elm.title,
		content: document.getElementById("preview").innerHTML,
		height: size,
		width: 680,
		options: {
			handleOversize: "resize"
		}
	});
}