Load / save XML Highscores

I have a piece of code that checks to see if my highscores are in place and i need it to save and load the high score data.

Check to see if points have been assigned - Works

if(!highcombo||!highscore){
    high_combo.text="x1";
high_score.text="000pts";


}else{
    high_combo.text="x"+highcombo;
high_score.text=highscore+"pts";
}

Sets High Scores and High Combos - Works

if(totalscore<currentscore){
totalscore=calcscore;


}else{
    currentscore=calcscore;


}
highscore=totalscore;
//Get High Combo
if(totalcombo<currentcombo){
totalcombo=combo;


}else{
    currentcombo=combo;


}
highcombo=totalcombo;
high_combo.text="x"+highcombo;
high_score.text=highscore+"pts";



XML File - Highscore.xml

<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<application xmlns="http://ns.adobe.com/air/application/3.2">
  <score>000</score>
    <combo>1</combo>
</application>