function showrss()
{
	var url = 'gettagxml.php';
	var tag = $F('tag');
	var pars = 'tag='+encodeURIComponent(tag);
	var myAjax = new Ajax.Request(
		url, 
		{
			method: 'get', 
			parameters: pars, 
			onComplete: showResponse
		});
}
function showResponse(originalRequest)
{
	var txt='<ul>';
	xml =  originalRequest.responseXML;
	title = xml.getElementsByTagName("title");
	url = xml.getElementsByTagName("link");
	for (i=1; i<url.length; i++)
	{
		txt += '<li><a href="'+url[i].childNodes[0].nodeValue+'" target="_blank">'+title[i].childNodes[0].nodeValue+'</a></li>';
	}
	txt += '</ul>';
	$('result_rss').innerHTML = txt;
}