scrollrect jump to screen

hey guys. i've made a scrollrect in my scene and used a script to snap the pages. this works fine. but now i want to jump to a certain page with a button click. e.g. when i'm on page 3, i want to press the button to jump on page 10. hope you can help me, i'm getting crazy with this.

this is the script i used to snap the pages:

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 using System.Collections.Generic;
 [RequireComponent(typeof(ScrollRect))]
 public class ScrollRectSnap : MonoBehaviour
 {
     [Tooltip("the container the screens or pages belong to")]
     public Transform ScreensContainer;
     [Tooltip("how many screens or pages are there within the content")]
     public int Screens = 1;
     [Tooltip("which screen or page to start on")]
     public int StartingScreen = 1;
     private List<Vector3> m_Positions;
     private ScrollRect m_ScrollRect;
     private Vector3 m_LerpTarget;
     private bool m_Lerp;
     private RectTransform m_ScrollViewRectTrans;
 
 
     void Start()
     {
         m_ScrollRect = gameObject.GetComponent<ScrollRect>();
         m_ScrollViewRectTrans = gameObject.GetComponent<RectTransform>();
         m_ScrollRect.inertia = false;
         m_Lerp = false;
         m_Positions = new List<Vector3>();
         if (Screens > 0)
         {
             Vector3 startPos = ScreensContainer.localPosition;
             Vector3 endPos = ScreensContainer.localPosition + Vector3.left * ((Screens - 1) * m_ScrollViewRectTrans.rect.width);
             for (int i = 0; i < Screens; ++i)
             {
                 float horiNormPos = (float) i / (float)(Screens - 1);
                 // this does not seem to have an effect [Tested on Unity 4.6.0 RC 2]
                 m_ScrollRect.horizontalNormalizedPosition = horiNormPos;
                 m_Positions.Add(Vector3.Lerp(startPos, endPos, horiNormPos));
             }
         }
         // this does not seem to have an effect [Tested on Unity 4.6.0 RC 2]
         m_ScrollRect.horizontalNormalizedPosition = (float)(StartingScreen - 1) / (float)(Screens - 1);
     }
     void FixedUpdate()
     {
         if (m_Lerp)
         {
             ScreensContainer.localPosition = Vector3.Lerp(ScreensContainer.localPosition, m_LerpTarget, 10 * Time.deltaTime);
             if (Vector3.Distance(ScreensContainer.localPosition, m_LerpTarget) < 0.001f)
             {
                 m_Lerp = false;
             }
         }
     }
     /// <summary>
     /// Bind this to UnityEditor Event trigger Pointer Up
     /// </summary>
     public void DragEnd()
     {
         if (m_ScrollRect.horizontal)
         {
             m_Lerp = true;
             m_LerpTarget = FindClosestFrom(ScreensContainer.localPosition, m_Positions);
         }
     }
     /// <summary>
     /// Bind this to UnityEditor Event trigger Drag
     /// </summary>
     public void OnDrag()
     {
         m_Lerp = false;
     }
     Vector3 FindClosestFrom(Vector3 start, List<Vector3> positions)
     {
         Vector3 closest = Vector3.zero;
         float distance = Mathf.Infinity;
         foreach (Vector3 position in m_Positions)
         {
             if (Vector3.Distance(start, position) < distance)
             {
                 distance = Vector3.Distance(start, position);
                 closest = position;
             }
         }
         return closest;
     }
 }        

i also added an event trigger.

i really hope you can help me! thank you.