Please edit your post to add code tags.
Here is one way to send an integer value (as binary):
Yval=analogRead(Ypin);
rf_driver.send((uint8_t *)&Yval, 2); //two bytes on AVR Arduino
and receive:
int value=0;
int buflen = 2; // max number of bytes allowed in message
if (driver.recv((uint8_t *) &value, &buflen))
{ if (buflen == 2) //got correct message size?
{ // do something with "value"