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Yes, you can use:<br>
<pre>&lt;a href=<a class="moz-txt-link-rfc2396E" href="javascript:layer.setVisibility(true);">"javascript:layer.setVisibility(true);"</a> &gt;Show&lt;/a&gt;
&lt;a href=<a class="moz-txt-link-rfc2396E" href="javascript:layer.setVisibility(false);">"javascript:layer.setVisibility(false);"</a> &gt;Hide&lt;/a&gt;
&lt;a href=<a class="moz-txt-link-rfc2396E" href="javascript:layer.setVisibility(!layer.getVisibility());">"javascript:layer.setVisibility(!layer.getVisibility());"</a> &gt;Toggle&lt;/a&gt;

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Where "layer" is the layer to show/hide.<br>
<br>
<pre class="moz-signature" cols="72">Regards, Kenneth Skovhede, GEOGRAF A/S
</pre>
<br>
<br>
Kenny skrev:
<blockquote cite="mid:92A1AB3C81264A64AA7340D5D39B5A67@KennyPC"
 type="cite">
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  <p class="MsoNormal"><font face="Arial" size="2"><span
 style="font-size: 10pt; font-family: Arial;">Hi All,</span></font></p>
  <p class="MsoNormal"><font face="Arial" size="2"><span
 style="font-size: 10pt; font-family: Arial;"> </span></font></p>
  <p class="MsoNormal"><font face="Arial" size="2"><span
 style="font-size: 10pt; font-family: Arial;">Is it possible (example)
to “turn” a layer on /
off without using the layers switcher on the map?</span></font></p>
  <p class="MsoNormal"><font face="Arial" size="2"><span
 style="font-size: 10pt; font-family: Arial;"> </span></font></p>
  <p class="MsoNormal"><font face="Arial" size="2"><span
 style="font-size: 10pt; font-family: Arial;">I mean if I have a marker
layer I can click a link and
display / hide a specific layer?</span></font></p>
  <p class="MsoNormal"><font face="Arial" size="2"><span
 style="font-size: 10pt; font-family: Arial;"> </span></font></p>
  <p class="MsoNormal"><font face="Arial" size="2"><span
 style="font-size: 10pt; font-family: Arial;">Thanks</span></font></p>
  <p class="MsoNormal"><font face="Arial" size="2"><span
 style="font-size: 10pt; font-family: Arial;"> </span></font></p>
  <p class="MsoNormal"><font face="Arial" size="2"><span
 style="font-size: 10pt; font-family: Arial;">K-</span></font></p>
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 style="font-size: 12pt;"> </span></font></p>
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  <br>
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The Trial and Professional version does not have this message in the
email<br>
  <pre wrap="">
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