public void loadRocketImages(){// loads rocket images into a 2d arraylist 
    	rocketImages = new ArrayList();
    	
    	int i = 1;
    	int j = 1;
    	
    	while(true){ //cycle through i
    		ArrayList r_img = new ArrayList();
    		while(true){ //cycle through j
	    		String name = "rockets/" + i + "r" + j + ".png";
	    		File file = new File("images/" + name);
	    		if(!file.exists()){
	    			j = 1;
	    			break;
	    		}
	    		//rocketImages.add(getSmallerImage(loadImage(name), .5f));
	    		r_img.add(getSmallerImage(loadImage(name), 1f));
	    		j++;
	    	}// end j loop
    		i++;
    		rocketImages.add(r_img); // add arraylist of images to arraylist of rockets
    		String name = "rockets/" + i + "r" + j + ".png";
    		File file = new File("images/" + name);
    		if(!file.exists()){
    			break;
    		}
    		
    	}// end i loop
	    	
    }