[oasi]

Ok,

I think this has to work...

<script type="text/javascript">
function checkURL()
  {
      if ((url.indexOf("http://")!=url.lastIndexOf("http://"))||url.lastIndexOf("http://")!=0){return false;}
      if (url.indexOf('"')>=0) {return false;}
      if (url.indexOf("http://maps.google")!=0){return false;}
      return true
  }

tot='';
tot_ini="{param}";
tot_no_quo=tot_ini.replace(/&quot;/g,'"');
if(tot_no_quo.indexOf("[url")>0)
{ //The URL affaire...
  if(tot_no_quo.indexOf('[url="')>0) {tot=tot_no_quo.substr(tot_no_quo.indexOf('[url="')+6,tot_no_quo.length);tot_no_quo='';}
  if(tot_no_quo.indexOf('[url=')>0)  {tot=tot_no_quo.substr(tot_no_quo.indexOf('[url=')+5,tot_no_quo.length);tot_no_quo='';a=tot.replace(/\]/g,'"');tot=a;}
  if(tot_no_quo.indexOf('[url]')>0)  {tot=tot_no_quo.substr(tot_no_quo.indexOf('[url]')+5,tot_no_quo.length);a=tot.replace(/\[/g,'"');tot=a;}
}
else
{ tot=tot_no_quo.substr(tot_no_quo.indexOf('src="')+5,tot_no_quo.length);}
url=tot.substr(0,tot.indexOf('"'));
urlp=url.replace(/amp;/g,'');
url=urlp;

if (checkURL())
{   
    document.write('<iframe width="640" height="480" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="'+url+'"></iframe>');
}
else
{
document.write("<p><b>La URL que has passat per al mapa contenia errors, edita el post per arreglar-ho</b></p>Recorda que cal enganxar el contingut del camp que indica que es per enganxar en una web.<br />Un cop arreglat el post, has de recarregar la plana per poder veure si ha funcionat.");
}
</script>