function onClick(){
        document.getElementById("feed").innerHTML = "loading...";
        var query = document.getElementById("query").value;
        query = encodeURIComponent(query);
        var jsonpURL = "http://gdata.youtube.com/feeds/videos?vq=" + query + "&max-results=5&alt=json-in-script&callback=youtubecallback";
        var script = document.createElement('script');
        script.type = 'text/javascript';
        script.src = jsonpURL;
        var head = document.getElementsByTagName("head")[0];
        head.appendChild(script);
}

function youtubecallback(json)
{
	var entries = json.feed.entry;
	var html = "";
	for (var i = 0; i < entries.length; ++i) 
	{
		html += entries[i].content.$t;
	}

	document.getElementById("feed").innerHTML = html;
}