expected '(' before 'scan'

hi
can me problem/error in code. error message says:

test.ino: in function 'void loop()':
test:60: error: expected '(' before 'scan'
expected '(' before 'scan'

thank you
michael (148dino)

code: [select]

#include <newping.h>

#define motorh1 2
#define motorh2 3
#define motorv1 4
#define motorv2 5
#define triggerpin 6
#define echopin 7
#define maxdistance 100
newping sonar(triggerpin, echopin, maxdistance);
int distance;
int triggerdistance = 30;
int fdistance;
int vdistance;
int hdistance;
unsigned int time;
void setup() {
  serial.begin(9600);
  pinmode(triggerpin, output);
  pinmode(echopin, input);
  pinmode(motorh1, output);
  pinmode(motorh2, output);
  pinmode(motorv1, output);
  pinmode(motorv2, output);
  serial.println("det virker!");
}
void loop() {
  if (serial.available() > 0)
  {
    int data = serial.read();
    switch(data)
    {
      case 'w' :
        frem();
        break;
      case 's' :
        tilbage();
        break;
      case 'a' :
        venstre();
        break;
      case 'd' :
        hojre();
        break;
      case 'e' :
        stands();
        break;
      case 'q' :
        dans();
      default :
        break;
    }
  }
  else if
  scan(); //the program says error lays here.
  fdistance = distance;
  if (fdistance < triggerdistance)
  {
    tilbage();
    delay(1000);
    hojre();
    delay(500);
    stands();
    scan();
    hdistance = distance;
    venstre();
    delay(1000);
    stands();
    scan();
    vdistance = distance;
    if (vdistance < hdistance)
    {
      hojre();
      delay(200);
      frem();
    }
    else {
      frem();
    }
  }
  else {
    frem();
  }
}
void frem()
{
  serial.println("kører fre,");
  digitalwrite(motorh1, high);
  digitalwrite(motorh2, low);
  digitalwrite(motorv1, high);
  digitalwrite(motorv2, low);
}
void tilbage()
{
  serial.println("kørere tilbage");
  digitalwrite(motorh1, low);
  digitalwrite(motorh2, high);
  digitalwrite(motorv1, low);
  digitalwrite(motorv2, high);
}
void venstre()
{
  serial.println("kører venstre");
  digitalwrite(motorh1, low);
  digitalwrite(motorh2, high);
  digitalwrite(motorv1, high);
  digitalwrite(motorv2, low);
}
void hojre()
{
  serial.println("kører venstre");
  digitalwrite(motorh1, high);
  digitalwrite(motorh2, low);
  digitalwrite(motorv1, low);
  digitalwrite(motorv2, high);
}
void stands()
{
  serial.println("standser");
  digitalwrite(motorh1, low);
  digitalwrite(motorh2, low);
  digitalwrite(motorv1, low);
  digitalwrite(motorv2, low);
}
void scan(){
  time = sonar.ping();
  distance = time / us_roundtrip_cm;
  if (distance == 0)
  {
    distance = 100;
  }
  serial.print(distance);
  serial.println("cm");
  delay(10);
}
void dans()
{
  serial.println("danser");
  digitalwrite(motorh1, high);
  digitalwrite(motorh2, low);
  digitalwrite(motorv1, low);
  digitalwrite(motorv2, high);
  delay(1000);
  digitalwrite(motorh1, low);
  digitalwrite(motorh2, high);
  digitalwrite(motorv1, high);
  digitalwrite(motorv2, low);
  delay(1000);
  digitalwrite(motorh1, high);
  digitalwrite(motorh2, low);
  digitalwrite(motorv1, high);
  digitalwrite(motorv2, low);
  delay(500);
  digitalwrite(motorh1, low);
  digitalwrite(motorh2, high);
  digitalwrite(motorv1, low);
  digitalwrite(motorv2, high);
  delay(500);
  digitalwrite(motorh1, low);
  digitalwrite(motorh2, low);
  digitalwrite(motorv1, low);
  digitalwrite(motorv2, low);
  delay(100);
}

code: [select]

  else if  // <---- lookup if syntax/usage
  scan(); //the compiler detected error here.

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