How Do I Drag And drop GUITextures From Set Positions?

I simply want to be able to loot an enemy and have the looted item go to a default position in the inventory.

If the default position is taken, then I want the item to go to the position next to the default one.

And so on.

So far, I have an inventory system. In this script I have assigned a spot for each item:

var items : List.; var spaces : List.;

var itemCount : int;

function Awake () {

spaces.Add(Rect(279, 225, 66, 63)); spaces.Add(Rect(344, 225, 66, 63)); spaces.Add(Rect(409, 225, 66, 63));

spaces.Add(Rect(279, 160, 66, 63)); spaces.Add(Rect(344, 160, 66, 63)); spaces.Add(Rect(409, 160, 66, 63));

spaces.Add(Rect(279, 96, 66, 63)); spaces.Add(Rect(344, 96, 66, 63)); spaces.Add(Rect(409, 96, 66, 63));

spaces.Add(Rect(279, 32, 66, 63)); spaces.Add(Rect(344, 32, 66, 63)); spaces.Add(Rect(409, 32, 66, 63));

}

function Update () {

itemCount = items.Count;

for (var item in items) {

(item as GameObject).transform.position = Vector3(0, 0, 1);

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

item = items[i];

(item as GameObject).guiTexture.pixelInset = spaces[i];

}

}

}

But because I have set the position of the item I can't move it to another spot, any Ideas on how to correct this?

Or:

Anyone know how to drag and drop an item to another location?

Thank you for your time!