function RemoveParamURL(URL, Param){
// return the URL without its parameter Param
var Turl = URL.split(/[?&]/);
var Exp = new RegExp('^'+Param+'=.*');
URL = Turl[0]+'?';
for (var ind=1; ind<Turl.length; ind++) {
if(!Turl[ind].match(Exp))
URL += (URL[URL.length-1]=='?'?'':'&') + Turl[ind];
}
return URL;
}