turn off script with a key..

hey i have a script that locks the mouse i need the script to turn off when i press escape then turn back on when i re press it, the escape button is what gets me into the menu... the script i have it... any ideas?? or re writes to it... to fix my issue

 function Update () {
 Screen.showCursor = false;
 Screen.lockCursor = true;
 Screen.lockCursor = false;
 }
 var paused : boolean = false;
 function Update () 
 { 
    if(Input.GetKeyDown("escape")
    {
       paused  = !paused ;
       if(paused) //Do Stuff When Paused
       {
           Screen.showCursor = true; 
       }
       else // Do stuff when unpaused
       {
           Screen.showCursor = false; 
       }             
    }
 }