loading problem

I have a script that creates 2 GUI buttons (one LOAD and the other New Game)...how can i get the file to load ? my problem is that im calling a "function LoadXML()" inside another function "OnGUI" butI dont know how to make the function LoadXML() work once activated ....

the code is:

 var shownewgame : boolean = false;
 var showcontinue : boolean = false;
 var levelToLoad : String;
 var soundhover : AudioClip;
 var beep : AudioClip;
 var QuitButton : boolean = false;
 
 function OnMouseEnter(){
 audio.PlayOneShot(soundhover);
 }
 function OnMouseUp(){
 animation.CrossFade("PlayButtonAnimation");
 audio.PlayOneShot(beep);
 yield new WaitForSeconds(0.1);
 if(QuitButton){
 Application.Quit();
 }
 shownewgame = true;
 showcontinue = true;
 }  
 
 function Update(){}
 
 function OnGUI(){
 if(shownewgame == true){
     if(GUI.Button(Rect(0,40,200,30),"New Game")){
        Application.LoadLevel(levelToLoad); //Code for new game button
     }
 }
 if(showcontinue == true){
     if(GUI.Button(Rect(0,80,200,30),"Continue")){
         
         //Code for continue button
         function LoadXML()
 {
    //StreamReader r = File.OpenText(_FileLocation+"\\"+ _FileName);
    var r : StreamReader = File.OpenText(_FileLocation+"/"+ _FileName);
    var _info : String = r.ReadToEnd();
    r.Close();
    _data=_info;
    Debug.Log("File Read");
 }//Code for continue button
     }
 }
 }
 
 
 @script RequireComponent(AudioSource)