hi
How can I check in the template *.ss one of the variables if it is empty?
I try

<% if Linkwww %>
  <div class="Linkwww"><a href="http://{$Linkwww}">$Linkwww</a></div>
<% end_if %>

but nothing goes

How are you defining your variable?

Test it out with:
<% if Content %>
This page has content!
<% end_if %>

That should work.

--

If blocks (http://doc.silverstripe.com/doku.php?id=templates)

<% if Property %>
<% end_if %>

If blocks let you mark off optional content in your template. The optional content will only be shown if the requested field / method returns a nonzero value.

thanks
But as it turned out the problem in another

l have next code on my ProdHolder.ss
<% control Children %>
<div class="ProdBl">
	<div class="prev"><a href="$Link" title="$Title.XML">$Photo.SetWidth(150)</a></div>
	<div class="Prodtext">
		<h4><a href="$Link" title="$Title.XML">$Title</a></h4>
		$Content
		$Linkwww
		<% if Linkwww %>
		<div class="Linkwww"><a href="http://{$Linkwww}">$Linkwww</a></div>
		<% end_if %>
	</div>
	<div class="clear1"><!-- --></div>
</div>
<% end_control %>