RFID, token does not work.

hello. have:
-atmega8 microboard m8
msx.cal24.pl/allegro/mb_m8/7.jpg

-usbasp programmer
msx.cal24.pl/elementy/usbasp_bialy/usbasp_przod.jpg

-rfid reader
nettigo.pl/products/48

-rs232<>usb converter

with converter read these id tokens:

code: [select]

05007e09196b blue token
0700437e506a yellow token
05003e2bfaea red token

my code is:

code: [select]

char c;
string msg;
int led = 4;

void setup() {
serial.begin(9600);
pinmode(led, output);
}

void loop() {
while(serial.available()>0){
c=serial.read();
msg += c;
}

if (msg.length() > 10) {
msg = msg.substring(1,13);

if (msg == "05007e09196b") {
digitalwrite(led, high);
} else {
digitalwrite(led, high);
delay(1000);
digitalwrite(led, low);
}

msg = "";
}
delay(300);
}

id 05007e09196b= token blue.
but when read blue token rfid reader program, program executes instructions 'else'. dont know wrong.

someone can me?

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