function _file_name(s)
{return (s.lastIndexOf("/") == -1) ? s : s.substr(s.lastIndexOf("/")+1);}

function _file_path(s)
{return (s.lastIndexOf("/") == -1) ? '' : s.substr(0, s.lastIndexOf("/")+1);}

function swap_images(ilarge, ismall)
{
    d=document;
    var s1=d[ismall].src, s2=d[ilarge].src;
    d[ismall].src = _file_path(s1) + _file_name(s2);
    d[ilarge].src = _file_path(s2) + _file_name(s1);
}

function set_image(ilarge, ismall)
{
    d=document;
    var s1=d[ismall].src, s2=d[ilarge].src;
    d[ilarge].src = _file_path(s2) + _file_name(s1);
}


function viewPriceFor(p1)
{
   var p = p1

   if (p == '') p = "n";
   var el = document.getElementsByTagName("p");
   for (i=0; i<el.length; i++)
   {
      re = /price_(\d+|n)/
      if (re.test(el[i].id))
      {
         el[i].style.display = (el[i].id == "price_" + p) ? 'block' : 'none';
      }
   }

   p = p1
   if (p == '') p = "0";
   el = document.getElementsByTagName("a");
   for (i=0; i<el.length; i++)
   {
      re = /pdf_(\d+)/
      if (re.test(el[i].id))
      {
         el[i].style.display = (el[i].id == "pdf_" + p) ? 'block' : 'none';
      }
   }
}