[devote]

<div id="info"></div>
<script type="text/javascript">
function ajax( url, callback ) {
 
    var req = new XMLHttpRequest();
 
    req.open( 'GET', url, true );
    req.onreadystatechange = function() {
 
        if ( req.readyState === 4 ) {
 
            if ( req.status >= 200 && req.status < 300 || req.status === 304 ) {
                callback && callback( req.responseText, this.responseXML );
            } else {
                throw new Error( 'not found' );
            }
        }
    }

    req.send( null );
}
 
var nocache = "&nocache=" + Math.random()*1000000,
    url = "rss.news.yahoo.com/rss/topstories";
 
ajax( "xmlget.php?url=" + url + nocache, function( data, xml ) {
 
    var out = '';
 
    if ( xml != null ) {
 
        var titles = xml.getElementsByTagName('title');
 
        for ( var j = 0; j < titles.length; ++j )  {
            out += titles[j].childNodes[0].nodeValue + '<br />'
        }
        document.getElementById('info').innerHTML = out;
    } else {
        document.getElementById('info').innerHTML = "Что-то не то получили: " + data;
    }
 
});
</script>

и PHP выглядит так:

<?php

    if ( isset( $_GET['url'] ) ) {
        if ( ini_get( 'magic_quotes_gpc' ) == 1 ) {
            $_GET['url'] = stripslashes( $_GET['url'] );
        }
 
        header('Content-Type: text/xml');
        echo file_get_contents( "http://".$_GET['url'] );
    }

?>