How can I set a css ":hover" on a DOM created element in JavaScript?

I'm using the DOM to manage a JSON response from an AJAX function I'm running. The script I'm writing needs to be completely portable, so I am defining the styles for the created elements on the fly (meaning, no linking to an external CSS, and no providing CSS in the HTML doc itself, because I won't have control of the doc).

I'd like to create a hover effect on some of the elements.

example:

 #myDiv:hover { background:#000000; }

Is there a way to define that in the DOM? Or do I have to use mouseover?

From stackoverflow

• You can dynamically create and manipulate stylesheets. See here for some of the cross-browser issues with this approach.

  I've got a wrapper function lying around which works around some of them; using it, the code would read

  document.createStyleSheet().addRule('#myDiv:hover', 'background:#000000;');
  

• you may create element with predefined class:

  .h:hover{color: #c00}
  
  var elem = document.createElement('div');
  elem.className = 'h'
  

  johnnietheblack : good, and yes...however i didn't have the ability to link to a stylesheet