if(document.images) {
   img_aboutus_a=new Image();
   img_aboutus_na=new Image();
   img_work_a=new Image();
   img_work_na=new Image();
   img_neotech_a=new Image();
   img_neotech_na=new Image();
   img_science_a=new Image();
   img_science_na=new Image();
   img_teaching_a=new Image();
   img_teaching_na=new Image();
   img_publications_a=new Image();
   img_publications_na=new Image();
   img_phorum_a=new Image();
   img_phorum_na=new Image();
   img_contacts_a=new Image();
   img_contacts_na=new Image();

   img_aboutus_a.src="../images/menu/button_aboutus_over_dot.gif";
   img_aboutus_na.src="../images/menu/button_aboutus_off_dot.gif";
   img_work_a.src="../images/menu/button_work_over_dot.gif";
   img_work_na.src="../images/menu/button_work_off_dot.gif";
   img_neotech_a.src="../images/menu/button_neotech_over_dot.gif";
   img_neotech_na.src="../images/menu/button_neotech_off_dot.gif";
   img_science_a.src="../images/menu/button_science_over_dot.gif";
   img_science_na.src="../images/menu/button_science_off_dot.gif";
   img_teaching_a.src="../images/menu/button_teaching_over_dot.gif";
   img_teaching_na.src="../images/menu/button_teaching_off_dot.gif";
   img_publications_a.src="../images/menu/button_publications_over_dot.gif";
   img_publications_na.src="../images/menu/button_publications_off_dot.gif";
   img_phorum_a.src="../images/menu/button_phorum_over_dot.gif";
   img_phorum_na.src="../images/menu/button_phorum_off_dot.gif";
   img_contacts_a.src="../images/menu/button_contacts_over_dot.gif";
   img_contacts_na.src="../images/menu/button_contacts_off_dot.gif";

   img_phaboutus_a=new Image();
   img_phaboutus_na=new Image();
   img_phwork_a=new Image();
   img_phwork_na=new Image();
   img_phneotech_a=new Image();
   img_phneotech_na=new Image();
   img_phscience_a=new Image();
   img_phscience_na=new Image();
   img_phteaching_a=new Image();
   img_phteaching_na=new Image();
   img_phpublications_a=new Image();
   img_phpublications_na=new Image();
   img_phphorum_a=new Image();
   img_phphorum_na=new Image();
   img_phcontacts_a=new Image();
   img_phcontacts_na=new Image();

   img_phaboutus_a.src="../../images/menu/button_aboutus_over_dot.gif";
   img_phaboutus_na.src="../../images/menu/button_aboutus_off_dot.gif";
   img_phwork_a.src="../../images/menu/button_work_over_dot.gif";
   img_phwork_na.src="../../images/menu/button_work_off_dot.gif";
   img_phneotech_a.src="../../images/menu/button_neotech_over_dot.gif";
   img_phneotech_na.src="../../images/menu/button_neotech_off_dot.gif";
   img_phscience_a.src="../../images/menu/button_science_over_dot.gif";
   img_phscience_na.src="../../images/menu/button_science_off_dot.gif";
   img_phteaching_a.src="../../images/menu/button_teaching_over_dot.gif";
   img_phteaching_na.src="../../images/menu/button_teaching_off_dot.gif";
   img_phpublications_a.src="../../images/menu/button_publications_over_dot.gif";
   img_phpublications_na.src="../../images/menu/button_publications_off_dot.gif";
   img_phphorum_a.src="../../images/menu/button_phorum_over_dot.gif";
   img_phphorum_na.src="../../images/menu/button_phorum_off_dot.gif";
   img_phcontacts_a.src="../../images/menu/button_contacts_over_dot.gif";
   img_phcontacts_na.src="../../images/menu/button_contacts_off_dot.gif";
} 

function on_img(type) {
   if(document.images) {
      switch(type) {
         case "aboutus":
            document.aboutus_dot.src=img_aboutus_a.src;
            break;
         case "work":
            document.work_dot.src=img_work_a.src;
            break;
         case "neotech":
            document.neotech_dot.src=img_neotech_a.src;
            break;
         case "science":
            document.science_dot.src=img_science_a.src;
            break;
         case "teaching":
            document.teaching_dot.src=img_teaching_a.src;
            break;
         case "publications":
            document.publications_dot.src=img_publications_a.src;
            break;
         case "phorum":
            document.phorum_dot.src=img_phorum_a.src;
            break;
         case "contacts":
            document.contacts_dot.src=img_contacts_a.src;
            break;

         case "phaboutus":
            document.aboutus_dot.src=img_phaboutus_a.src;
            break;
         case "phwork":
            document.work_dot.src=img_phwork_a.src;
            break;
         case "phneotech":
            document.neotech_dot.src=img_phneotech_a.src;
            break;
         case "phscience":
            document.science_dot.src=img_phscience_a.src;
            break;
         case "phteaching":
            document.teaching_dot.src=img_phteaching_a.src;
            break;
         case "phpublications":
            document.publications_dot.src=img_phpublications_a.src;
            break;
         case "phphorum":
            document.phorum_dot.src=img_phphorum_a.src;
            break;
         case "phcontacts":
            document.contacts_dot.src=img_phcontacts_a.src;
            break;
         default:
            break;
      }
   }
}

function off_img(type) {
   if(document.images) {
      switch(type) {
         case "aboutus":
            document.aboutus_dot.src=img_aboutus_na.src;
            break;
         case "work":
            document.work_dot.src=img_work_na.src;
            break;
         case "neotech":
            document.neotech_dot.src=img_neotech_na.src;
            break;
         case "science":
            document.science_dot.src=img_science_na.src;
            break;
         case "teaching":
            document.teaching_dot.src=img_teaching_na.src;
            break;
         case "publications":
            document.publications_dot.src=img_publications_na.src;
            break;
         case "phorum":
            document.phorum_dot.src=img_phorum_na.src;
            break;
         case "contacts":
            document.contacts_dot.src=img_contacts_na.src;
            break;


         case "phaboutus":
            document.aboutus_dot.src=img_phaboutus_na.src;
            break;
         case "phwork":
            document.work_dot.src=img_phwork_na.src;
            break;
         case "phneotech":
            document.neotech_dot.src=img_phneotech_na.src;
            break;
         case "phscience":
            document.science_dot.src=img_phscience_na.src;
            break;
         case "phteaching":
            document.teaching_dot.src=img_phteaching_na.src;
            break;
         case "phpublications":
            document.publications_dot.src=img_phpublications_na.src;
            break;
         case "phphorum":
            document.phorum_dot.src=img_phphorum_na.src;
            break;
         case "phcontacts":
            document.contacts_dot.src=img_phcontacts_na.src;
            break;

         default:
            break;
      }
   }
}