function showDiseases(classname)
 {
   var select = document.getElementsByName(classname);
   if (!select.length)
   {
   	 var sel1 = document.getElementsByTagName("div");
   	 var select = new Array();
     for(i=0, j=0; i < sel1.length; i++)
     {
       atr = sel1[i].getAttribute("name");
       if (atr == classname)
       {
       	 select[j] = sel1[i];
       	 j++;
       }
     }
   }

   for(i=0; i < select.length; i++)
   {
     switch(select[i].style.display)
     {
       case 'none':
         select[i].style.display = 'block';
        break;

       case 'block':
         select[i].style.display = 'none';
        break;
     }

   }
 }