• RegExp, match, replace
function sv(v) {
var r = new RegExp("&s=[0-9]+");
if(window.location.href.match(r))
window.location.href = window.location.href.replace(r,"&s="+v);
else window.location.href = window.location.href+"&s="+v;
}
var ur = document.getElementById( ...
http://qindex.info/i.php?x=3499