General :: How To Refresh A Graphical Display Through Bash Script?

I need to display a message graphically using a messagebox or textbox through bash script. However the message should be keep changing every 4 secs . I input the message from a file and use "gxmessage" to display it .

I do not like this solution and it looks ugly too , because it is visible that the message box is getting killed and forked every time..Can't I use the same gxmessage message box for all the messages just by putting new messages and hence refreshing the same box.Any idea , anything other than gxmessage will do , if a solution is somewhere else.