header row items doesnt appear

if the width of the grid object (ex:obj.setSize(800,360);) less than the needed width for the data the scroll appears but when use it the header row items outside the region doesn't appear

this image show the problem
http://img689.imageshack.us/i/gridi.jpg/

it works fine with IE 8 but appears in FF 3.6.1
Kindly advice

the problem was in this line in the css file

#grid .aw-header-0 {
DISPLAY: inline;
WIDTH: 100p%;
HEIGHT: 100%;
COLOR: #ffffff;
}

once removed it ran correctly