function md(coded, key, go){
   shift=coded.length;
   link="";
   for(i=0; i<coded.length; i++){
     if (key.indexOf(coded.charAt(i))==-1) {
       ltr   = coded.charAt(i);
       link += (ltr);
     }else{     
       ltr   = (key.indexOf(coded.charAt(i))-shift+key.length) % key.length;
       link += (key.charAt(ltr));
     }
   }
   if(go == true){
      location.href = 'mailto:'+link;
   }else{
      return link;
   }
}

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