How to pick up an object using a GUITexture - unity3d

Question

How can I implement a GUITexture for picking up an object?
The problem is I have a GetButtonUp input, how can I change it to GUI Button?
The use is a layer type of my tag type. Here is the code:
#pragma strict
var Primary : Item; //Your Primary item holder
var Secondary : Item; //Your Secondary item holder
var myLayerMask : LayerMask;
private var HitItem : GameObject; //Item that raycast hits.
function Update ()
{
if(Input.GetButtonUp("Use")) //Remember to make new Input called "Use" :)
{
var hit: RaycastHit;
var Direction = transform.TransformDirection(Vector3.forward);
Debug.DrawRay(transform.position, Direction * 2.5, Color.blue); //Shows raycast when you press "Use"
if(Physics.Raycast(transform.position, Direction, hit, 2.5, myLayerMask))
{
if(hit.transform.tag == "Item") //If raycast hits transform.tag "Item".
{
HitItem = hit.transform.gameObject; //HitItem becomes hit.gameObject.
var ItemScr : ItemScript = HitItem.GetComponent("ItemScript");
if(ItemScr.MyItem.IsSecondary) //If Hit item is Secondary
{
if(Secondary.ActiveObj == null) //Checks if you dont have Secondary Item
{
Secondary = ItemScr.MyItem;
Destroy(hit.transform.gameObject);
if(Primary.ActiveObj == null) //Checks if you have already
{ //equipped item in your hand.
Secondary.ActiveObj.active = true;
}
else if(Primary.ActiveObj)
{
if(Primary.ActiveObj.active == false)
{
Secondary.ActiveObj.active = true;
}
}
}
}
//And same to primary :)
if(!ItemScr.MyItem.IsSecondary) //If Hit item is Primary
{
if(Primary.ActiveObj == null) //If you don't have primary, goes on...
{
Primary = ItemScr.MyItem;
Destroy(hit.transform.gameObject);
if(Secondary.ActiveObj == null)
{
Primary.ActiveObj.active = true;
}
else if(Secondary.ActiveObj)
{
if(Secondary.ActiveObj.active == false)
{
Primary.ActiveObj.active = true;
}
}
}
}
}
}
}
}

Answer 1

Any call with GUI needs to be called in the OnGUI() method. And usually GUI scripts are put separate from other parts of your program and attached to the main camera or an empty object.
-Personally I use main camera.
Unity had a good walk through Here
And if you want to change to c# i suggest google, which I believe should be a perfect source for this type of question.