jQuery(document).ready(function() { 
  
  /* all divs with class infobutton (here - the dna-infobutton) get the hover-callback */
  jQuery(".infobutton").hover( over_infobutton_image, out_infobutton_image );
  
  
  /* toggle my_dna_infobox */
  function over_infobutton_image() {		
    jQuery("#my_dna_info").show();   
  }	
  function out_infobutton_image() {
  	jQuery("#my_dna_info").hide();    
  }

});