C152 INSTRUCTOR AND TRAINEE WENT OFF THE RWY ON LNDG.

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ON OCT/XA/98 AROUND XA15 I WAS INSTRUCTING ON C152 WITH MR X. HE IS A PRE-SOLO STUDENT FROM MY COMPANY. WE WERE PRACTICING TOUCH-AND-GOES AT MBO; MS; ON RWY 17 IN PREPARATION FOR HIS FIRST SOLO. FSS RPTED WIND 160 DEGS; 10 KTS; GUSTING TO 15 KTS AROUND JACKSON MUNI ARPT. THE STUDENT I WAS FLYING WITH IS A PRE-SOLO 25 HR TOTAL TIME PVT PLT STUDENT. HE IS A 55 YR OLD MAN WITH AN ENTHUSIASTIC SPIRIT AS A PLT. AFTER ALMOST 1 HR OF FLT ON THE TFC PATTERN; APCHING RWY 17; WE TOUCHED DOWN WITH NO PROB. I SUGGESTED ON THE PREVIOUS LNDG TO TAKE IT EASY ON THE USE OF THE RUDDER IN COMPENSATING FOR THE WIND. HE PULLED THE NOSE UP AND APPLIED THE R RUDDER AT THE SAME TIME; CAUSING THE PLANE TO VEER TO THE R. I PROMPTLY TOOK COMMAND OF THE AIRPLANE AND TOLD HIM 'MY PLANE!' I STEERED THE PLANE BACK TOWARD THE CTRLINE BY APPLYING EASY L RUDDER TO AVOID GETTING OFF OF THE RWY. THE SPD WAS TOO LOW (AROUND 40 KTS) TO APPLY FULL PWR AND IT WAS TOO RISKY. THE PLANE NOW HAD 1 WHEEL ON THE GRASS AND 1 WHEEL ON THE RWY. EARLIER THAT MORNING; IT WAS RAINING; THEREFORE; I DID NOT APPLY TOO MUCH PRESSURE TO THE BRAKES BECAUSE THE GRASS WAS WET AND THE PLANE WOULD SKID. I LIFTED THE NOSE UP UNTIL THE PLANE STOPPED BTWN 20-30 FT FROM THE RWY WITH NO PROB. I CHKED MY STUDENT AND FOR TFC; THERE WAS NO TFC IN SIGHT; AND I PROCEEDED BACK TO THE RWY WHICH WAS APPROX 4 - 4 1/2 INCHES HIGHER THAN THE GND. I HAD NO KNOWLEDGE OF THIS BECAUSE THE GRASS WAS TOO HIGH. THIS CAUSED THE NOSEWHEEL TO SWING TO THE R AND HIT AGAINST THE 4 - 4 1/2 INCH SHOULDER OF THE RWY. I SHUT OFF THE ENG AND CHKED OUT THE PROB. I FOUND OUT THAT THE FENDER (COWL) ON THE NOSEWHEEL WAS BROKEN. WE THEN LIFTED THE NOSE UP ON THE PLANE AND PUSHED IT ONTO THE RWY. I RESTARTED THE ENG; CHKED THE TFC AND RETURNED THE PLANE TO THE RAMP AND THEN TO THE HANGAR. I THEN INFORMED THE MECH ON DUTY OF THE PROB AND THE SIT AT HAND.