javascript/css style

i have javascriprt function that there is an id name and i need to call the value into html.   now it is possible to add the id name inside my html value, particular in input text value.

example.

i have id from javascript. #itismyidname

PHP Code:

$("#itismyidname").html('<img src="images/ajax-loader.gif" />'); 


here is what i want,

PHP Code:

<input type="text" size="20" name="code[]" value="<span id = 'itismyidname'></span> " /> 


if it is possible kindly advice..