there are probably much more efficient ways to do this, but as long as you have the user IDs you can put them into the ids array here:
Code:
<body>
<div id="results"></div>
<script type="text/javascript">
function showUser(o){
document.getElementById("results").innerHTML+=o.query.results.body.div.center.div[0].div.div[3].ul.li[2].span.content.split(" ")[1]+"<br>";
}
var ids=[24880,25580,27380]
for (var i = 0; i < ids.length; i++) {
getUser(ids[i])
}
function getUser(num){
if (document.getElementById("giffgaff")){
document.body.removeChild(document.getElementById("giffgaff"));
}
var myurl=encodeURIComponent("http://community.giffgaff.com/t5/user/viewprofilepage/user-id/"+num)
scr=document.createElement("script");
scr.type="text/javascript";
scr.id="giffgaff"
scr.src='http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20html%20where%20url%3D%22'+myurl+'%2F%22&format=json&callback=showUser';
document.body.appendChild(scr);
}
</script>
</body>