public Map<Id, DateTime> photos {
    get {
        if(photoIds == null) {
            photoIds = new Map<Id,DateTime>();
            for(Attachment att : [select Id,CreatedDate from Attachment where ParentId = :account1.Id and name LIKE '%.jpg' LIMIT 5]) {
                //photoIds.put(1,att.Id);
                //photoIds.put(2,att.CreatedDate);
                photoIds.put(att.Id,att.CreatedDate);

            }
        }

        return photoIds;
    }
}

<apex:repeat value="{!photos}" var="photo">
            <th  class="tg-031e">
                <apex:outputlink value="{!URLFOR($Action.Attachment.Download, photo)}" id="theLink" onclick="window.open(this.href, 'mywin',