Get matching browser prefix for css.

getBrowserPrefix.js

function getBrowserPrefix( propName ) {

  var prefixes = ['Moz','Webkit','ms']; // also O and Khtml

	for ( var len = prefixes.length; len--; ) {
	  if( ( prefixes[len] + 'Transform' ) in document.body.style  ) {
	    return '-' + prefixes[len].toLowerCase() + '-' + propName;
	  }
	}
	
  return propName;
}