string::size_type apos = arg.find("=");
if ( apos != string::npos ) {
string a = arg.substr( 0, apos );
string b = arg.substr( apos + 1 );
string::size_type apos = arg.find("=");
if ( apos != string::npos ) {
string a = arg.substr( 0, apos );
string b = arg.substr( apos + 1 );