if(typeof wbsGalleryShowThumb != 'function')
var wbsGalleryShowThumb = function(url,entityfk,idfk,idx)
{
    var pars = 'action=showthumb&entityfk='+entityfk+'&idfk='+idfk+'&idx='+idx;
    var myAjax = new Ajax.Updater('gallery_preview',
    url, { method: 'post', parameters: pars, evalScripts: true,insertion:Insertion.Top});
};