function mostrar(obj){
	$('[type=grande]').slideUp();
	var all=obj.parentNode.getElementsByTagName('img');
	for (i=0,j=all.length;i<j;i++) 
		if (all[i] == obj) var ident=i;
	
	var grandes=$(obj).parent().next().children().each(function(pos){
		if (pos==ident) {
			if (this.style.display!='block') {
				$(this).slideDown();
			}else{
				$(this).slideUp();
			}
		
		}
	});
}