Raj,

A little tip -- for future posts, you do not need the <UL>...</UL> HTML tags to underline a link. This is done automatically. In fact, you can paste URLs as-is, without HTML tags at all. The Forum formats them for you.

The </UL> breaks your:
<UL><A HREF="http://www.kmitl.ac.th/~kswichit/LFrobot/LFrobot.htm</UL>">http://www.kmitl.ac.th/~kswichit/LFrobot/LFrobot.htm</UL></A>

Which should have been:
<A HREF="http://www.kmitl.ac.th/~kswichit/LFrobot/LFrobot.htm">http://www.kmitl.ac.th/~kswichit/LFrobot/LFrobot.htm</A>

Resulting in:
http://www.kmitl.ac.th/~kswichit/LFrobot/LFrobot.htm