function insertContact (region) {
   var charAt = '@'
   var showTo = 'sales';

   if (region) {
      showTo += '.' + region;
   }

   var showDom = 'avonauto.com';
   
   var showHTML = '<a href="' + 'ma';
   showHTML += 'ilt' + 'o:' + showTo;
   showHTML += charAt + showDom + '">';
   showHTML += showTo + charAt;
   showHTML += showDom + '</a>';   
   
   document.write (showHTML); 
}