// Place your applic7ation-specific JavaScript functions and classes here
// This file is automatically included by javascript_include_tag :defaults

function checkPresence(field) {
  var re = new RegExp("[a-z0-9._%+-]+@[a-z0-9.-]+\\.[a-z]{2,4}");
  var hint = ($F(field).length == 0 || !($F(field).match(re))) ? "< !" : "";
  if ($(field + '_hint')) {
   $(field + '_hint').update(hint);
  }
  else {
    content = '<span class="validation" id="' + field + '_hint">' +
    hint + '</span>';
    new Insertion.After(field, content);    
  }
  if (hint.length == 0) {
    $(field).setStyle({backgroundColor: 'lightgreen'});
   } else {
    $(field).setStyle({backgroundColor: 'pink'});
   }
}