var showTag = function (container_class, tag, target, el) {
    if ($$('.' + container_class).length < 1)
    	location.href = target;

    $$('.' + container_class).invoke('hide');
    
    $$('.' + container_class + '.' + tag).each(function(els){
    	new Effect.BlindDown(els, {duration: 0.3});
    });
    
    $$('.portfoliolinks').each(function(els){
    	els.removeClassName('active');
    });
    
    el.addClassName('active');
}