WWW image method to change raw image texture. Script problem.

Trying to make a sliding gallery that creates prefab raw images, pulls images from a folder, then changes the texture of those (which it does) but there seems to be a hitch on how the file is "downloaded" locally, lagging the load and loading every single prefab with the same image.

 using UnityEngine;
 using System.Collections;
 using System.IO;
 using UnityEngine.UI;
 
 public class SlideGallery : MonoBehaviour
 {
 
     public GameObject Image;
     int number;
     string path;
     int imagenum;
     int numberpath;
     Texture2D img;
 
     public void OnClick()
     {
 
         GameObject init = GameObject.Find("Initializer");
         Initializer original = init.GetComponent<Initializer>();
         path = original.directory;
 
         while (File.Exists(path + "Screenshot_" + number.ToString("000") + ".png"))
         {
 
             GameObject NewImage = Instantiate(Image, Vector3.zero, Quaternion.identity) as GameObject;
             NewImage.transform.SetParent(this.transform, false);
             NewImage.transform.parent = transform;
             NewImage.name = "Image" + number.ToString("000");
             StartCoroutine(Loadimage());
             number++;
         }
         print("The last number is " + number + "! Melissa is a hottie!");
     }
 
     public IEnumerator Loadimage()
     {
         WWW www = new WWW("file://" + path + "Screenshot_" + number.ToString("000") + ".png");
         img = new Texture2D(4, 4, TextureFormat.DXT5, false);
         www.LoadImageIntoTexture(img);
         yield return www;
 
         RawImage NewImage = GameObject.Find("Image" + imagenum.ToString("000")).GetComponent<RawImage>();
         NewImage.texture = img;
         imagenum++;
         numberpath++;
     }
 
 }

Is there maybe something I can put in between making the new prefab to wait for the new file to get acquired first?