Help with a simple AI

Hey guys I have made a simple waypoint function but I am having a bit of trouble. What I want it to do is this:

locate closest waypoint, go to it, if it reaches it, search again without including the one its currently on.

As you can see in the code below: (distanceToWayPoints[closest] < totalDistance) that block of code has to be changed

void WayPoint() {

// total distance

int totalDistance = 10;

 // goes through all the waypoints
 for (int nStart = 0; nStart < MaxNoOfWPs; nStart++)
 {
     // calculates all the distances from the monster to each waypoint
     distanceToWayPoints[nStart] = Vector3.Distance(everyWayPointInLevel[nStart].transform.position, transform.position);

     // if its the closest waypoint than have it be the target
     if (distanceToWayPoints[nStart] < distanceToWayPoints[closest])
     {
         closest = nStart;
         target = everyWayPointInLevel[closest].transform.position;

         //used as temp to know which one was the last wp
         lastWayPoint = everyWayPointInLevel[closest].transform.position;
     }

     // if the enemy gets close enough to the waypoint, trigger this = 
     if (distanceToWayPoints[closest] < totalDistance)
     {
         // THIS HAS TO BE CHANGED
         // so that instead of placing the wp at 0,0,0
         // it makes it not calculate the wp in the search
         everyWayPointInLevel[closest].transform.position = new Vector3(0,0,0);

     }
 }
 // animation
 animation.CrossFade("walk");
 // speed
 speed = walkingSpeed;

}