No Loop Time Options in Animation Inspector

Hi, When I select my animation in the Project window, there is no 'loop time' check box option in the inspector (the only option is wrap mode). This is the script I am using to play my animation upon button press, but at the moment, when I play the animation, it does not stop after 1 play and continues to loop forever.

This is the script I am using:

 var  animation_bool : boolean ;
        function Update()
                       {
            if(animation_bool == true)
                       {
                   GetComponent.<Animation>().Play("Attack1");
                       }
            if(Input.GetButtonDown("Fire1"))
                       {
                animation_bool = true;
                       }
 
               }

Here is a screenshot showing the Inspector window of my animation: http://imgur.com/vYscBkG

How do I get the 'loop time' option to show, or, how do I change my script/animation so that it only plays once upon button press?

Thanks - Ethan