viewml bug or microwin bug?

I am newbie to viewml. i have built viewml upon flnx on pc. I used scr_x11 
in video drivers in microwindows-0.89. I set the SCREEN_WIDTH to 320 &  
SCREEN_HEIGHT to 240 in microwin config file and run viewml on PC, but it 
seems that it can only show part of the web page because it has neither 
vertical scroll  bar nor horizon scroll bar. but when I set the SCREEN_WIDTH 
to 640 and SCREEN_HEIGHT to 480 , everything is fine. why ? i wondered that 
who caused this!! could anyone give me any suggenstion?

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