U.Helper

<script type="text/javascript">
$(document).ready(function(){
$('a[href^="http:"]').each(function(){
if(this.host!==location.host){this.href=location.host+'/go.html?'+this.href;}
});});
</script>

if(this.host!==location.host) this.href='/go.html?'+this.href;

var link = document.getElementsByTagName('a');
for (var i = 0; i < link.length; i++) {
if (link[i].host.replace(/^w{3}\./i, '') != location.host) link[i].href += '/some_page.html';
}

    <script type="text/javascript">
var link = document.getElementsByTagName('a');
for (var i = 0; i < link.length; i++) {
     if (link[i].host!= location.host) link[i].href='/go.html?'+link[i].href;
}
</script>

var a = document.getElementsByTagName('a');
for (var i = 0; i < a.length; i++) {
if (a[i].host.substr(a[i].host.indexOf('www.') != -1 ? 4 : 0) != location.host) a[i].href += 'some_page.html';
}