how to preview screenshot immediately after its taken ??

i am using following script to preview the screenshot but i am not being able to display the latest screenshot.. plz if any one can correct the script then please help with this.

 using UnityEngine;
 using System.Collections;
 using System.IO;
 public class TakeScreenshot : MonoBehaviour
 {    
     public long screenshotCount = 8;
     long i = 0;
 
     public int imgcnt = 0;
     public bool clicked;
     public GUIStyle capSty;
     public GameObject myPreviewObject;
     //private int currentSlide = 1;
     public WWW www;
     public string screenshotFilename;
     public string screenshotFilename2;
 
 
     void Awake()
     {
         
         //check if directory doesn't exit
         if (!System.IO.Directory.Exists("D//SliderImages/Screenshots"))
         {
             //if it doesn't, create it
             System.IO.Directory.CreateDirectory("D://SliderImages/Screenshots");
         }
 
         if (!System.IO.Directory.Exists("D//SliderImages/Screenshots/tempApp"))
         {
             //if it doesn't, create it
             System.IO.Directory.CreateDirectory("D://SliderImages/Screenshots/tempApp");
         }
       
 
 
     
      // Add file sizes.
      
      DirectoryInfo d = new DirectoryInfo("D://SliderImages/Screenshots");
      FileInfo[] fis = d.GetFiles();
      foreach (FileInfo fi in fis)
      {
          if (fi.Extension.Contains("jpg"))
              i++;
      }
     screenshotCount = i;
 
     }
 
 
     // Check for screenshot key each frame
     void Update()
     {
         // take screenshot on up->down transition of F9 key
         if (Input.GetKeyDown("f9"))
         {
             clicked = true;
 
             do
             {
                 screenshotCount++;
                 screenshotFilename = "D://SliderImages/Screenshots/" +"screenshot" + screenshotCount + ".jpg";
                 
             } while (System.IO.File.Exists(screenshotFilename));
             Application.CaptureScreenshot(screenshotFilename);
             StartCoroutine ("showImg");
     
          }
     }
 
 
     IEnumerator showImg(){
         yield return new WaitForSeconds (1.0f);
         DirectoryInfo d = new DirectoryInfo("D://SliderImages/Screenshots/");
         FileInfo[] fis = d.GetFiles();
         foreach (FileInfo fi in fis)
         {
             if (fi.Extension.Contains("jpg"))
                 imgcnt++;
         }
 
         print ("IMAGES IN DIRECTORY"+imgcnt);
 
         //yield return new WaitForSeconds (1.0f);
         string[] filePaths = Directory.GetFiles ("D://SliderImages/Screenshots/" , "*.jpg");
         print (filePaths.Length);
         print (filePaths.Length - 1);
 
         www = new WWW ("file://" + filePaths [filePaths.Length-1]);                 
         yield return www;
                 
 
         capSty.normal.background = www.texture;
         clicked = true;
         yield return new WaitForSeconds (1.0f);
         clicked = false;
     }
 
     void OnGUI()
     {
         if (clicked) {
                         GUI.Button (new Rect (0, 0, 1024, 768), "", capSty);
                 }
     }
 }