function open_new(w,h) 
{
window.open("","JSL",'toolbar=0,location=0,scrollbars=1,width='+w+',height='+h+',resizable=0,top=50,left=50');
}

    var  scriptsOn = true;

   function RegisterImage(imgName, imgOn, imgOff)
   {
       if (scriptsOn) {
           eval (imgName + "On = new Image()");
           eval (imgName + "On.src = \"" + imgOn + "\"");
           eval (imgName + "Off = new Image()");
           eval (imgName + "Off.src = \"" + imgOff + "\"");
       }
   }

   function ImageOver(imgName)
   {
       if (scriptsOn)
           eval ("document." + imgName + ".src = " + imgName + "On.src");
   }

   function ImageOut(imgName)
   {
       if (scriptsOn)
           eval ("document." + imgName + ".src = " + imgName + "Off.src");
   }
   
   RegisterImage ("buta", "/img/button_1_a.gif","/img/button_1_b.gif");
   RegisterImage ("butb", "/img/button_2_a.gif","/img/button_2_b.gif");
   
   
   function Menu(x)
   {
    if(x==1)
     {
     ImageOver('buta');
     ImageOut('butb');
     document.getElementById('menu1').style.display = 'block';
     document.getElementById('menu2').style.display = 'none';
     }
    if(x==2)
    {
    ImageOver('butb');
    ImageOut('buta');
    document.getElementById('menu2').style.display = 'block';
    document.getElementById('menu1').style.display = 'none';
    }
   }
   
function prm(d)
{
 if(document.getElementById(d).style.display == 'none')
  {
  document.getElementById(d).style.display = 'block';
  }
 else
  {
  document.getElementById(d).style.display = 'none';
  }

}