How to add text area with one click select.

How to add text area with one click select having specific height and width to the post.I am adding the below html code as i used in my blogger http://www.pr9link.com .But not displays the actual height and width in my wordpress blog – http://www.pr9link.info

<textarea cols=”50″ name=”mytextarea” onclick=”this.focus(); this.select();” rows=”4″ style=”background: none repeat scroll 0% 0% height: 100px; margin: 0pt auto; padding: 5px; width: 382px;”></textarea>

if anyone helps me to make it, please help me.Now i am using inframe ” text file to show the content”.