Hi Friend,
I have solved the Problem...
Here's the solution. DO Mark it as solved :)
<input autocomplete='off' id='filter' name='filterpenulis' type='text' value='' önkeyup="var url='filter.php?key='+encodeURIComponent(document.getElementById('filter').value); $('#showpenulis').load(url); return false;">
<div id="showpenulis"></div>
And the PHP File.
echo urldecode($_GET['key']);
The Problem was that the URL was not encoded thereby the issues. I encoded the URI using jQuery's encodeURIComponent() function and then decoding it in filter.php using PHP's urldecode() function.
Hope that it will help you...
With Regards
Tushar Srivastava