var Mon  = "images/p3.gif";
var Moff = "images/p2.gif";
var Son  = "images/lp2.gif";
var Soff = "images/lp1.gif"; 
var offs = 7;
var a_img = 0;
var max_img = 0;

function hl_on(i)
{
//   getElementById("M1").background-img = "images/p3.gif";
   if(i == 12)
      document.getElementsByTagName("td")[i+offs].background = "images/lo2.gif";      
   else
      document.getElementsByTagName("td")[i+offs].background = "images/p3.gif";
   
   
} // HL_on

function hl_off(i)
{
//   getElementById(i).background = "images/p2.gif";
   if(i == 12)
      document.getElementsByTagName("td")[i+offs].background = "images/lo1.gif";      
   else
      document.getElementsByTagName("td")[i+offs].background = "images/p2.gif";
} // HL_off

function hs_on(i)
{
   document.getElementsByTagName("td")[i+6].background = "images/lp2.gif";
} // HL_on

function hs_off(i)
{
   document.getElementsByTagName("td")[i+6].background = "images/lp1.gif";
} // HL_off

function show_pic(i, max_a)
{
   a_img = i;
   max_img = max_a;
//     alert ("hi");
//   alert  (document.getElementById("A"+i).src);
   document.getElementById("sj2").src = document.getElementById("A"+i).src;
   document.getElementById("dsj2").style.visibility = "visible";
   document.getElementById("dsj1").style.visibility = "hidden";
   if (i == max_img)
      document.getElementById("fore").style.visibility = "hidden";      
   else
      document.getElementById("fore").style.visibility = "visible";      
   if (i == 0)
      document.getElementById("back").style.visibility = "hidden";      
   else
      document.getElementById("back").style.visibility = "visible";      
}

function chng_pic(i)
{
   a_img += i;
//     alert ("hi");
//   alert  (document.getElementById("A"+i).src);
   if (a_img == max_img)
      document.getElementById("fore").style.visibility = "hidden";      
   else
      document.getElementById("fore").style.visibility = "visible";      
   if (a_img == 0)
      document.getElementById("back").style.visibility = "hidden";      
   else
      document.getElementById("back").style.visibility = "visible";      

   document.getElementById("sj2").src = document.getElementById("A"+a_img).src;
   document.getElementById("dsj2").style.visibility = "visible";

}

function hide()
{
   document.getElementById("dsj2").style.visibility = "hidden";
   document.getElementById("dsj1").style.visibility = "visible";

}