Found what I want:
in NetWebServerWorkerBase.CreateMapDiv Procedure(String p_ID, <String p_Class>, <String p_Width>, <String p_Height>)
for my purpose i change the code from:
if instring('px',lower(p_width),1,1) or instring('pt',lower(p_width),1,1) or instring('em',lower(p_width),1,1) or instring('%',p_width,1,1)
loc:style.SetValue('width:' & clip(p_width) & ';')
else
loc:style.SetValue('width:' & clip(p_width) & 'px;')
end
to:
if instring('px',lower(p_width),1,1)
loc:style.SetValue('width:' & clip(p_width) & 'px;')
END
if instring('pt',lower(p_width),1,1)
loc:style.SetValue('width:' & clip(p_width) & 'pt;')
END
if instring('em',lower(p_width),1,1)
loc:style.SetValue('width:' & clip(p_width) & 'em;')
END
if instring('%',p_width,1,1)
loc:style.SetValue('width:' & clip(p_width) & '%;')
END
and also for the height...