function fnRollInJpg(button){
  document.getElementById(button).src="http://www.heathclaibornegallery.com/images/"+ button +"_g.jpg";
 }

 function fnRollOutJpg(button){
  document.getElementById(button).src="http://www.heathclaibornegallery.com/images/"+ button +".jpg";
 }