JavaScript 1.2 and newer
window.location.reload();
// If we needed to force the document to be fetched from the
// web server again (such as where the document contents
// change dynamically but cache control headers are not
// configured properly), Firefox supports a non-standard
// parameter that can be set to true to bypass the cache:
//window.location.reload(true);
JavaScript 1.1
window.location.replace(window.location.pathname + window.location.search + window.location.hash);
// does not create a history entry
JavaScript 1.0
window.location.href = window.location.pathname + window.location.search + window.location.hash;
// creates a history entry