public static void addPrestigeTree(String prestige) {
		BlankTree bt = new BlankTree();
		
		//we do not allow multiple of the same tree
		for(ClassTree ct : takenPrestigeTrees){ 
			if(ct.getPrestige().equals(prestige))
				return;
		}
		
		//find the first tree that is blank and replace the blank tree with our new class tree
		for(EnhancementTree e : takenPrestigeTrees){ 
			if(e.getClass().equals(bt.getClass())){ 
				takenPrestigeTrees.set(takenPrestigeTrees.indexOf(e) , new ClassTree(prestige)); 
				break;
			}
		}
			
//		if(takenPrestigeTrees.size() < 6) //only 6 trees allowed
//			takenPrestigeTrees.add(new ClassTree(prestige));
		return;
	}