Properly use speed arg of vid_shake

FB_tricks.c

@@ -60,12 +60,12 @@ void vid_shake(char speed) {
 		
 		for(j=(shake_dist * -1); j<shake_dist; j+=shake_stride) {
 			PVR_SET(PVR_BITMAP_Y, ((bitmapy + j) << 16) | (bitmapy +j));
-			thd_sleep(5);
+			thd_sleep(speed);
 		}
 		
 		for(j=shake_dist; j>(shake_dist * -1); j-=shake_stride) {
 			PVR_SET(PVR_BITMAP_Y, ((bitmapy + j) << 16) | (bitmapy +j));
-			thd_sleep(5);
+			thd_sleep(speed);
 		}
 	}
 	
@@ -246,7 +246,7 @@ int main(int argc, char **argv) {
 				continue;
 			}
 			else if(st->buttons & CONT_A) {
-				vid_shake(-1);
+				vid_shake(5);
 				start_secs = 0;
 			}
 			else if(st->buttons & CONT_B) {