Inserting value to AjaxControlToolkit.HTMLEditor using javascript

Question

I'm using AjaxControlToolkit.HTMLEditor, and I want to add value to it using javascript or jquery like this:

alert( $find("eCompose_ctl02_ctl01")); // if 

$find("eCompose_ctl02_ctl01").attr('value') = "asdfasdfasdf  asdfasd asdf sf";

also tried like this:

 document.getElementById('eCompose_ctl02_ctl01').value += "ababsakas asdasd l";

But the above code does not insert text into HTMLEditor. Can anyone help me? thanks...