Script help please

Hi i'm kinda new to scripting and i cant get this script to work correctly when i click r i dont gain any XP when i have that implemented though :P if someone could PLEASE go through the script and tell me wat i did wrong and maybe upload the correct version of the script! Thanksin advance for your help! (and if you find any other problems please comment them below!)

//XP You'll start out with!

 var curXP : int = 0;
 
 //XP Untill next LVL Up!
 
 var maxXP : int = 100;
 
 //LVL To start out with!
 
 var curLVL : int = 0;
 
 //LVL Untill prestiging!
 
 var maxLVL : int = 10;
 
 //Prestige To start out with!
 
 var curPrestige : int = 0;
 
 //Max prestige (maxLVL + maxPrestige = HIGHEST LEVEL POSSIBLE!)
 
 var maxPrestige : int = 5;
 
 //The text type of game object you will need to add in the game!
 
 var lvlText: GUIText;
 
 
 
 function Update () {
  
 lvlText.text = " Level " + curLVL + " MaxLevel " + maxLVL + " XP " + curXP + " XPUntillNextLevel " + maxXP;
 
 
 if (curXP == maxXP) {
 
 levelup ();
 
 }
 
 
 
 if (curLVL == maxLVL) {
 
 prestige ();
 
 }
 
 
 }
 
 if(Input.GetKeyDown(" r ")) {
  
 curXP += 10;
  
 }
 
 
 function levelup () {
 
 curXP = 0; 
 maxXP = maxXP + 100;
 curLVL ++;
 
 }
 
 function prestige () {
 
 if (Input.GetKeyDown(" + ")) {
 
 curLVL = 1;
 curPrestige = 1;
 curXP = 0;
 
 }
 
 
 
 }