guitexture to act as a button on the keyboard or mouse

i ve been looking all over the net and i cant find anything. i ve tried everything and cant get it to work

i want a gui Texture to do say Fire1 or Jump or anything that i have in my InputManager.

i m using gui.buttons and they work fine but i dont want to have to adjust each button on the different resolutions of phones. i find gui textures much easier

this is the gui.button script

 #pragma strict
 var input : InputItem;
 
 var position : Vector2; //position of button
 var dimensions : Vector2; //size of button
 var label : String; //text in button
 var toggle : boolean = false; //is this button a toggle?
 @HideInInspector
 var toggled : boolean = false; //are we currently toggled on?
 var showInStore : boolean = false;
 private var used : boolean = false;
 
 private var touched : boolean = false; //had we already touched the button
 private var touching : boolean = false; //are we currently touching the button
 @HideInInspector
 var curTouch : int = -1; //what touch id is this using?
 var useUpdate : boolean = true;
 
 function Update () {
     if(useUpdate)
         UpdateFunction();
 }
 
 function UpdateInput() {
     if(!useUpdate)
         UpdateFunction();
 }
 
 function UpdateFunction () {     
     //are we touching the button this frame?
     if(Input.touches.Length > 0){
         for(var touch : Touch in Input.touches){ //for each touch
             //Is this touch within our button?
             touching = Within(touch.position, Rect(position.x, position.y, dimensions.x,dimensions.y));
             if(touching){
                 curTouch = touch.fingerId; //save which touch we are using
                 break;
             }
         }
     } else {
         touching = false;
     }
     
     if(toggle){ //Toggle button
         input.got = toggled;
         
         if(touching){
             if(!touched){ //first frame touching the button
                 touched = true;
                 
                 input.up = toggled;
                 toggled = !toggled; //invert the toggle
                 input.down = toggled;
             } else {
                 input.down = false;
                 input.up = false;
             }
         } else {
             input.down = false;
             input.up = false;
             touched = false;
             curTouch = -1;
         }
         
     } else { //Normal Button
         if (touching){ //We are touching
             input.got = true; //the button is down
             input.up = false; //the button is not up
                 
             if(!touched){// we hadn't already touched the button (first frame holding it)
                 input.down = true; //the button was got
                 touched = true; //we have touched    
             } else {
                 input.down = false; //it isn't down because this isn't the first fram holding it
             }
         } else { //We are not touching
             curTouch = -1;
             if (touched) {
                 input.up = true; //if we were holding the button last fram, then up is true because this is the frame it was released
             } else {
                 input.up = false;
             }
                 touched = false;
                     input.got = false;
                 input.down = false;
         }
     }
 }
 
 function OnGUI () {
     if(!DBStoreController.inStore || showInStore)
         GUI.Button(Rect(position.x, position.y, dimensions.x,dimensions.y),label);
 }
 
 function Within (pos : Vector2, bounds : Rect) : boolean {    
     pos.y = Screen.height - pos.y;
     return (pos.x > bounds.x && pos.x < (bounds.x + bounds.width) && pos.y > bounds.y && pos.y < (bounds.y + bounds.height));
 }

i would place the Fire1 gameobject as inputitem and it works i want the same thing for the gui.texture

please help been looking for an answer for days.