$(document).ready(function(){
  $(".em_cl").each(function(){
    var ats, dots, address, i;
    ats = [ ' at ', ' (at) ', ' [at] ' ];
    dots = [ ' dot ', ' (dot) ', ' [dot] ' ];
    address = $(this).html();
    for ( i = 0; i < ats.length; i++ ) {
      address = address.replace(ats[i], '@');
    }
    for ( i = 0; i < dots.length; i++ ) {
      address = address.replace(dots[i], '.');
    }
    $(this).html('<a href="mailto:' + address + '">' + address + '</a>');
  });
})