// Extracting a specific var from a URL string
// Ex:		getVarValueFromURL('VarName') returns value of VarName or -1 if VarName is unknown
function getVarValueFromURL(VarName){
	strURL = window.location.search;
	idxMax = strURL.length;
	idx = strURL.lastIndexOf(VarName);
	if (idx == -1){
		return idx;
	} else {
		idx += VarName.length +1;
		for (idxEnd=idx; idxEnd<=idxMax; idxEnd++){
			tmp = strURL.substr(idxEnd, 1);
			if (tmp.match(';') || tmp.match('&'))	break;
		}
	}
	return strURL.substring(idx, idxEnd);
}

var LGN;
if (getVarValueFromURL("LGN")== -1){
	LGN = 0;
}else{
	LGN = getVarValueFromURL("LGN");
}