I examined your code and I assume that your splitter is actually always 800px due to the used configuration and having a parent DIV element with such height. In order to make the spliter always occupy 100% of the page you should set such height to all its parent elements including the body, form and as shown in the demo below:
i did what u said but didnt change the result here is the screen shot
answered on 29 Jan 2010, 01:16 PM
Your screenshot shows that there is a parent element of the splitter which does not have explicit height set. Can you please provide a live url that I can examine? Once I receive it, I will find the problematic parent and help you fix the issue.