Strange Error in JScript when using "delete"

Hi! I ve got a really strange Error in this Inventory Script when using the "delete" Statement. If i click the button it should throw out the item ( if there is any item in this slot) an should delete this item. So i thought i could use "delete InventoryItem;" and it worked! But after i restarted my PC i got this error when running the Script again : inv2.js(106,38): UCE0001: ';' expected. Insert a semicolon at the end. I tried everything ( at least i think so ) to get it to work again .... but without success. Has anyone a idea how to get this to work again ???

var inventory : Array;

var ItemObject_1 : GameObject; var ItemTexture_1 : Texture2D;

var ItemObject_2 : GameObject; var ItemTexture_2 : Texture2D;

public var emptyTex : Texture;

public var inventorySizeX = 4; public var inventorySizeY = 5;

var iconWidthHeight = 40; var spacing = 4;

public var offSet = Vector2( 100, 100 );

class InventoryItem { var worldObject : GameObject; var texRepresentation : Texture2D; }

function Awake() { inventory = new Array(inventorySizeX);

for( var i = 0; i < inventory.length; i ++ )
{
    inventory[i] = new Array(inventorySizeY);
}

}

function OnGUI() {

var texToUse : Texture2D; var currentInventoryItem : InventoryItem;

    if(PlayerGUI.doWindow)
    {
         for( var i = 0; i < inventory.length; i ++ )
         {
             for( var k = 0; k < inventory[i].length; k ++ )
             {
                texToUse = emptyTex;
                currentInventoryItem = inventory[i][k];

                 if( inventory[i][k] != null)
                 {
                     texToUse = currentInventoryItem.texRepresentation;
                 }

                 var it = GUI.Button( new Rect( offSet.x+k*(iconWidthHeight+spacing), offSet.y+i*(iconWidthHeight+spacing), iconWidthHeight, iconWidthHeight ), texToUse );


                 if (it)
                 {
                     if(texToUse == ItemTexture_1) 
                         {
                         Instantiate(ItemObject_1,transform.position,transform.rotation);
                         //This is the Problem (Without this line the Code is working):
                         delete InventoryItem;
                         }


                     if(texToUse == ItemTexture_2) 
                         {
                         Instantiate(ItemObject_2,transform.position,transform.rotation);
                         }

                  }
             }
         }
      }

}

function AddItem( item : InventoryItem ) {

for( var i = 0; i < inventory.length; i ++ ) {

 for( var k = 0; k < inventory[i].length; k ++ )
 {

    if( inventory[i][k] == null )
     {
         inventory[i][k] = item;
         return;

     }
 }

}


}

function AddItem( worldObject : GameObject, texRep : Texture2D ) { var newItem = new InventoryItem();

newItem.worldObject = worldObject; newItem.texRepresentation = texRep;

AddItem( newItem ); }