how to use UIButton for downloading images like fb friends picture and will display accordingly in the UIButton

[jovel6]

using LitJson; using UnityEngine; using System.Collections; using System.Text; using Prime31; using System.Collections.Generic;

public class LoadJSON_FBFriends : MonoBehaviour {

private bool _movedContainer;
public Material loadImageMaterial;

private UIToolkit myToolkit;
UIButton touchable,b1;

private string userId;
private Dictionary<string, string> friends;
ArrayList friendsList;
public GUIStyle friendsFontStyle;

void Start()
{
    StartCoroutine(getImage());

    var scrollable = new UIScrollableVerticalLayout( 0 );
    scrollable.alignMode = UIAbstractContainer.UIContainerAlignMode.Center;
    scrollable.position = new Vector3( 0, 3, 0 );
    var width = UI.scaleFactor * 800;
    scrollable.setSize( width, Screen.height / 0.10f );

    for( var i = 0; i < 13; i++ )
    {

        if( i == 13 ) 
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0 );

        }
        else if( i % 12 == 0 )
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0);
        }
        else if( i % 11 == 0 )
        {
            touchable = UIButton.create( "FriendsAvatar.png", "FriendsAvatar.png", 0, 0);
        }
        else if( i % 10 == 0 )
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0 );
        }
        else if( i % 9 == 0 )
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0 );
        }
        else if( i % 8 == 0 )
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0 );
        }
        else if( i % 7 == 0 )
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0 );
        }
        else if( i % 6 == 0 )
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0 );
        }
        else if( i % 5 == 0 )
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0 );
        }
        else if( i % 4 == 0 )
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0 );
        }
        else if( i % 3 == 0 )
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0 );
        }
        else if( i % 2 == 0 )
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0 );
        }
        else 
        {
            touchable = UIButton.create( "FriendsListBox.png", "FriendsListBox.png", 0, 0);
        }

        loadImage(touchable, i);

        scrollable.addChild(touchable);

    }

}

IEnumerator getImage()
{

    string url = "https://graph.facebook.com/xxxxxxxx/friends?limit=5&fields=first_name,picture&access_token=xxxxxxxx";

    WWW www = new WWW(url);
    yield return www;

    ProcessFriendsDisplay(www.text);

}

public void ProcessFriendsDisplay(string jsonString)
{
    JsonData jsonFriends = JsonMapper.ToObject(jsonString);
    ConverterScript fbfriends = new ConverterScript();

    friendsList = new ArrayList();

    for(int i = 0; i<jsonFriends["data"].Count; i++)
    {   

        fbfriends.picture = jsonFriends["data"][i]["picture"]["data"]["url"].ToString();
        Debug.Log (fbfriends.picture + i);

        loadImage(touchable, i);

    }

}

void loadImage(UIButton uib, int i) 
{

    Texture2D tex = new Texture2D(50, 50);

    string UIButton = "touchable" + i;
    GameObject obj = GameObject.Find ("UIButton");
    obj.SendMessage("LoadBook", uib);

    uib.manager.renderer.material.mainTextureScale = new Vector2(18.0f,20.4f);
    uib.manager.renderer.material.mainTexture = tex;

}