Inventory GUI

Hello I downloaded this script from http://forum.unity3d.com/threads/my-contribution-inventory-system-free.53599/

a very basic inventory script but I have 2 issue with it.

1] I want to open/close the inventory with keydown ''i'' 2] I want to put the inventory box on the right side. It fully customize but the value on x stop at 999 and the box is only at half the screen. I have try a lot of value change but it down work.

 //This type of inventory display will be a bag. similair to WoW.
 var backDrop:Texture2D;
 var windowPosition:Vector2=Vector2(200,800);//where on the screen the window will appear.
 //this can easily be and should be updated on the fly incase the screen size changes or what not.
 var windowSize:Vector2=Vector2(96.0,96.0);//the size of the window the bag will be displayed.
 var itemIconSize:Vector2=Vector2(32.0,32.0);//The size of the item icons
 var updateListDelay=1.0;//This will be used to updated the inventory on screen, rather then
 //updating it every time OnGUI is called. if you prefer you can directly get what in the list. but i
 //dont like having multiple GetComponents >.<.
 var lastUpdate=0.0;//last time we updated the display.
 var UpdatedList:Transform[];
 var associatedInventory:Inventory;
 
 function UpdateInventoryList(){
     UpdatedList=associatedInventory.Contents;
 }
 function OnGUI(){
     //THIS BLOCK OF CODE IS JUST FOR PEOPLE TO MOVE THE BOX AROUND.
     //If your making a game you dont need anything this this.
     windowPosition.x = int.Parse(GUI.TextField(Rect (100, 10, 40, 20), ""+windowPosition.x, 3));
     windowPosition.y = int.Parse(GUI.TextField(Rect (100, 30, 40, 20), ""+windowPosition.y, 3));
     windowSize.x = int.Parse(GUI.TextField(Rect (100, 50, 40, 20), ""+windowSize.x, 3));
     windowSize.y = int.Parse(GUI.TextField(Rect (100, 70, 40, 20), ""+windowSize.y, 3));
     itemIconSize.x = int.Parse(GUI.TextField(Rect (100, 90, 40, 20), ""+itemIconSize.x, 3));
     itemIconSize.y = int.Parse(GUI.TextField(Rect (100, 110, 40, 20), ""+itemIconSize.y, 3));
     
     GUI.Label(Rect (0, 20, 400, 20), "WindowPosition X:");
     GUI.Label(Rect (0, 30, 400, 20), "WindowPosition Y");
     GUI.Label(Rect (0, 50, 400, 20), "WindowSize X");
     GUI.Label(Rect (0, 70, 400, 20), "WindowSize Y");
     GUI.Label(Rect (0, 90, 400, 20), "ItemIconSize X");
     GUI.Label(Rect (0, 110, 400, 20), "ItemIconSize Y");
     //THIS IS WHERE THE EDITING STUFF ENDS> FROM HERE BEFORE YOU would need.
     
     
     
     
     
     
     
     var currentX=windowPosition.x;//where to put the first items
     var currentY=windowPosition.y;
     //Draw the backdrop in the windowposition and the size of the windowsize.
     GUI.DrawTexture(Rect(windowPosition.x,windowPosition.y,windowSize.x,windowSize.y),backDrop,ScaleMode.StretchToFill);
     for(var i:Transform in UpdatedList){//we start a loop for whats in our list. You could 
     var item=i.GetComponent(Item);//we know that all objects in this list are items, cus we
     //will make sure nothing else can go in here, RIGHT? :P
     //directly call accocialtedInventory.Contents but i prefer not to since its more work for you and the pc.
         //I use a button since its easier to be able to click it and then made a drop down menu to delete or move
         if(GUI.Button(Rect(currentX,currentY,itemIconSize.x,itemIconSize.y),item.inventoryIcon)){
             associatedInventory.RemoveItem(i);//Remove the item from the list, well its transform neways
             item.BeDropped();//Drops the item.
             lastUpdate=0.0;//Set the lastupdate to 0 to allow the list to update.
         }
         currentX+=itemIconSize.x;
         if(currentX+itemIconSize.x>windowPosition.x+windowSize.x){
         //if the next item icon will be to large for the window.....
             currentX=windowPosition.x;//we move it back to its startpoint
             currentY+=itemIconSize.y;//and down a row.
             if(currentY+itemIconSize.y>windowPosition.y+windowSize.y){//if the row is down to far. we quit the loop
                 return;
             }
         }
     }
 }
 
 
 function FixedUpdate(){//I will update the display inventory here.
     if(Time.time>lastUpdate){
         lastUpdate=Time.time+updateListDelay;
         UpdateInventoryList();
     }
 }