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ARM7 and Winstar Graphic LCD

Hello everyone, I am working with the lpc2148 board and I am trying to interface it to a graphic LCD WG320240C0. The code I am trying it is not working. I have checked the control and data bus connections and it seems ok. I believe is that it is not working because of voltage level issues. The ARM works with 3.3V and the screen does it with 5V.
Could this be as i say?
How can I solve the problem? i have already tried with pull-ups but it didnt chage.
I also have doubts on how to connect the backlight and the LCD driving voltage. I dont want to blow anything...
Which are the correct input voltage for each?
thanks for the time

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