kyngchaos I realise that this thread is over a decade old, but someone might find this thread from Google, but there is a simple solution for your query.
Dokuwiki automatically applies classes onto hyperlinks depending on where the hyperlink leads (eg. internal and external links).
Simply change the CSS of these selectors.
/*____________ links to wiki pages ____________*/
/* existing wikipage */
.dokuwiki a.wikilink1 {
}
/* not existing wikipage */
.dokuwiki a.wikilink2 {
text-decoration: none;
}
.dokuwiki a.wikilink2:link,
.dokuwiki a.wikilink2:visited {
border-bottom: 1px dashed;
}
.dokuwiki a.wikilink2:hover,
.dokuwiki a.wikilink2:active,
.dokuwiki a.wikilink2:focus {
border-bottom-width: 0;
}
/* any link to current page */
.dokuwiki span.curid a {
font-weight: bold;
}
/*____________ other link types ____________*/
.dokuwiki a.urlextern,
.dokuwiki a.windows,
.dokuwiki a.mail,
.dokuwiki a.mediafile,
.dokuwiki a.interwiki {
background-repeat: no-repeat;
background-position: 0 center;
padding: 0 0 0 18px;
}
/* external link */
.dokuwiki a.urlextern {
background-image: url(../../images/external-link.png);
}
/* windows share */
.dokuwiki a.windows {
background-image: url(../../images/unc.png);
}
/* email link */
.dokuwiki a.mail {
background-image: url(../../images/email.png);
}