khashabawy is forgetting a lot of information to the users. You do the following in your admincp you go to CMS>Wigets make new widget for static html. Copy paste all the above code
Code:
<a href="http://tli.tl/t/I-love-This-site"
target="_blank"><img src="http://tli.tl/images/twitter.png" border="0"></a>
<div dir="ltr">
<form action="http://tli.tl/alp/" method="post">
<input type="hidden" name="tw" value="1"/>
<b>Your msg : </b><select name="tw_msg">
<option value="I enjoy here">I enjoy here</option>
<option value="Hay See this">Hay See this</option>
<option value="Here is my favourite site">Here is my favourite site</option>
</select>
<input type="submit" value="Tweet" />
</form></div>
in the static html box make the widget active on your frontpage. Now you have the coding right. When you press on the bird in the widget you make a tweet under your account if you login to twitter or are all ready logged in at twitter. In that tweet is a link that points to your website but that link is now like a tinyurl.