need help with this script

K, tested it and now updated:

 #pragma strict
 
 var explode:GameObject[];
 
 function Start () {
 
 }
 
 function Update () {
 
 }
 
 function OnGUI (){
     if(GUI.Button(Rect(0,0,50,30),"Explode")){
         var PI: float = 3.14;
         
         var size : int = explode.Length;
         var theta_scale : float = (2.0 * PI) / size;
         
         var r : float = 5;
         
         var theta : float = 0;
         for(var i = 0; i< explode.Length; i++)
         {
             var x : float = r*Mathf.Cos(theta);
             var y : float = r*Mathf.Sin(theta);
             
             theta = theta + theta_scale; 
             
             explode[i].transform.position= new Vector3(x, y, 0);
         }
     }
 }

this will place them around the orthogonal 0,0. If you want to modify the center position, just add the center coordinate to the x and y value.