U8glib: Graphics Lib for LCDs and OLEDs

Hi

I have been using the u8g Library to complete a university project. I have been playing around with it and must say that it is fantastic. The one problem I am having is that I want to display a line of ASCII print for a certain period of time, clear the entree screen and then write another set of ASCII text. I am using an ST7920 screen as it was the only one locally available as all shops have sold out of the KS0108. The screen i attached to a DFRobot mega clone...

Please if anyone can help me I have tried so many ways to get this to work but with no success

thanks in advance

Chris