you need to create a text box on whatever site Myspace for instance. In Myspace create a comment of this code
<form method="post" action="">
<textarea name="comments" cols="40" rows="5">
Enter your banner HTML code here...
</textarea><br>
<input type="submit" value="Submit" />
</form>
In the section where it says textarea name="comments" change the word comments to whatever you want to call your banner.
Where it says "Enter your banner HTML code here..." Enter your entire HTML Code.
when someone clicks on the text box it will highlight the TEXT inside it, which is the code you put in it. They can then paste that where ever they want your banner to appear on their page.