Topdown Shooter

2 questions I have the camera setup and have the crosshair but the problem is it follows my mouse where ever it goes..

How can I make it so it can only go around my character in a 360 radius without it flying all over the screen the reason I am asking this is because When I shoot It shoots where my player is facing instead of the where the crosshair gui is.

this is the crosshair script

 var position : Rect; var crosshairTexture : Texture2D;
 
 function OnGUI () {
 
     position = Rect( Input.mousePosition.x - (crosshairTexture.width / 2), (Screen.height - Input.mousePosition.y) - (crosshairTexture.height / 2), crosshairTexture.width , crosshairTexture.height );
 
     GUI.DrawTexture( position , crosshairTexture );
 
 }