function startswith(haystack, needle) {
	return( haystack.substr(0, needle.length) == needle );
}

var xmlhttp = new XMLHttpRequest();
xmlhttp.overrideMimeType('application/xml');
xmlhttp.open("GET", "/discussion/questions/", false);
xmlhttp.send();
var xmldoc = xmlhttp.responseXML;

var cr = xmldoc.getElementById('ContentRight');
for each(var a in cr.getElementsByTagName('a')) {
    var lnk = a.getAttribute('href');
    if(!startswith(lnk, '/discussion/users/')) continue;
    console.log(a); break;
}