Dynamically showing button

I would like a button to display ONLY when a link to a URL
exists in the database.
I could add an extra field in the database with the URL to
the button's image, but would prefer to do it dynamically.
I am sure its something like, if .... but not sure how
exactly to set it up.
C

How about this, this is in ASP though:
<%
if (rsName.Fields.Item("Link") <> "") then
<show button>
else
<do something else>
end if
%>

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    ## Detail 0 ##
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    ## Detail 0 ##
    oracle.jbo.JboException: JBO-29000: Unexpected exception caught: oracle.jbo.InvalidOperException, msg=JBO-26036: Recursive substituion for holx.oracle.apps.csp.portal.requirement.server.HolxReqLineVO.
    ## Detail 0 ##
    oracle.jbo.InvalidOperException: JBO-26036: Recursive substituion for holx.oracle.apps.csp.portal.requirement.server.HolxReqLineVO.

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