function getParamValue (sURL, Param, Default) {
// Extracts and returns the parameter value from the URL for the specified parameter.
// If the parameter does not occur is the URL, the default value is returned.
// This function is not Case-sensitive.
var sURLUpper = sURL.toUpperCase() + "&";
Param = Param.toUpperCase();
if (!Default) Default="";
var Pos = sURLUpper.indexOf (Param + "=" );
if (Pos==-1) return Default;
Pos = Pos + Param.length + 1;
return sURL.substring (Pos, sURLUpper.indexOf("&", Pos));
}
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