var text = window.location.href;

function delineate(str) {
theleft = str.indexOf("=") + 1;
theright = str.indexOf("&");
return(str.substring(theleft, str.length));
}

url=delineate(text);

function refreshFrame() {
if(window.location!=url)
frames['main_frame'].window.location.replace(url);
}