So I am practesing my translation and i decided to make a slide script in JS and it works like it should, so i started with the translation but I am having a problem in the sliding function itself it won’t do it.
My JS script:

var MyBoxLeft = -200.0;

var icon : Texture; var icon2 : Texture; var blankSkin : GUISkin;

function OnGUI () { GUI.skin = blankSkin; var tBoxRect = new Rect(MyBoxLeft, 20.0, 220, 720); var tButtonRect = new Rect(MyBoxLeft, 160.0, 120, 30); var tBoxArt = new Rect(MyBoxLeft, 200.0, 120, 120);

GUI.Box(tBoxRect, icon); GUI.Button(tButtonRect, "Click"); GUI.Box(tBoxArt, icon2); }

function Update () {

if (Input.GetKeyDown("space")) { AnimateBox(); }

}

function AnimateBox () {

if (MyBoxLeft == -200.0) {

    while (MyBoxLeft < 20.0) {
    MyBoxLeft+=5.0;
    yield;
    }

} else if (MyBoxLeft == 20.0) {

    while (MyBoxLeft > -200.0) {
    MyBoxLeft-=5.0;
    yield;
    }

}

}

and here is the C# script i have made:

using UnityEngine;
using System.Collections;

public class GUI_Script : MonoBehaviour
{

    float MyBoxLeft = -200f;

    public Texture icon;
    public Texture icon2;
    public GUISkin blankSkin;

    void OnGUI()
    {
        GUI.skin = blankSkin; 
        Rect tBoxRect = new Rect(MyBoxLeft, 20.0f, 220, 720);
        Rect tButtonRect = new Rect(MyBoxLeft, 160.0f, 120, 30);
        Rect tBoxArt = new Rect(MyBoxLeft, 200.0f, 120, 120);

        GUI.Box(tBoxRect, icon); GUI.Button(tButtonRect, "Click"); GUI.Box(tBoxArt, icon2);
    }

    void Update()
    {

        if (Input.GetKeyDown("space")) { AnimateBox(); }

    }

    void AnimateBox()
    {

        if (MyBoxLeft == -200.0f)
        {

            while (MyBoxLeft < 20.0f)
            {
                MyBoxLeft += 5.0f;
                yield return 0;
            }

        }
        else if (MyBoxLeft == 20.0f)
        {

            while (MyBoxLeft > -200.0f)
            {
                MyBoxLeft -= 5.0f;
                yield return 0;
            }

        }

    }
}

I know that I need to make the void AnimateBox() to a IEnumerator for it to say it works, but it will not scroll.

You need to make AnimateBox an IEnumerator and call it with StartCoroutine(AnimateBox());