Help with Hitachi HD44780 based 20x4 LCD

Hello I just got a 20x4 Hitachi HD44780 based LCD. Ive been playing around with it and hooking it up acording to the liquid crystal hello world tutorial at http://arduino.cc/en/Tutorial/LiquidCrystal. I can get the backlight to work but nothing is showing up on the display. It could be the fact that I haven't used a potentiometer to control the contrast. Any help would be appreciated. :)

Follow the tutorial and get a potentiometer. It's required. Then if you still have problem, post some pictures like this guy did. http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1278190981/0

I used the pwm pin to get the contrast right but now its only showing blocks. Unlike the other guy (on the other topic) im sure ive got all the pins round the right way

Sorry I did have something wrong in the but it is working now!