if (document.images)
   {
     forumNormal= new Image(56,70);
     forumNormal.src="images/forum_normal.gif";  

     forumOver= new Image(56,70);
     forumOver.src="images/forum_over.gif";

     searchNormal= new Image(55,70);
     searchNormal.src="images/search_normal.gif";  

     searchOver= new Image(55,70);
     searchOver.src="images/search_over.gif";

     checklistNormal= new Image(71,70);
     checklistNormal.src="images/checklist_normal.gif";  

     checklistOver= new Image(71,70);
     checklistOver.src="images/checklist_over.gif";

     syllabusNormal= new Image(155,48);
     syllabusNormal.src="images/syllabus_normal.gif";  

     syllabusOver= new Image(155,48);
     syllabusOver.src="images/syllabus_over.gif";

     tutorialsNormal= new Image(155,44);
     tutorialsNormal.src="images/tutorials_normal.gif";  

     tutorialsOver= new Image(155,44);
     tutorialsOver.src="images/tutorials_over.gif";

     teamsNormal= new Image(155,50);
     teamsNormal.src="images/teams_normal.gif";  

     teamsOver= new Image(155,50);
     teamsOver.src="images/teams_over.gif";

     contactNormal= new Image(155,46);
     contactNormal.src="images/contact_normal.gif";  

     contactOver= new Image(155,46);
     contactOver.src="images/contact_over.gif";

     homeNormal= new Image(155,58);
     homeNormal.src="images/home_normal.gif";  

     homeOver= new Image(155,58);
     homeOver.src="images/home_over.gif";

   }

function rollOver(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "Over.src");
      document[imgName].src= imgOn;
    }
 }

function rollOff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "Normal.src");
      document[imgName].src= imgOff;
    }
 }