How do you have the logo in the post box?

What is the code used to make it have a logo in the post box? Like how it says GraphicsCode... Thanks for the help

Its done through a CSS stylesheet:

#text_editor_textarea {
background : url(https://2img.net/h/oi33.tinypic.com/2cmnokw.png);
background-repeat:no-repeat;
background-position:center;
}

just replace the link fro your own image put it in a CSS style sheet and the image should show in textboxes.

Awsome this helped me to!
Thanks