Does anyone know how I can delete an attachment on a VF page by just using a link? I allow my users to upload images to be displayed and I want them to be able to just click a link or small button that allows them to delete the image.

I know I can use the <apex:listViews type="attachment"/> and see all the attachments and get the Edit | Del | View but I just want the delete button. While working with my DE account I was able to use this:

<apex:repeat value="{!Member__c.attachments}" var="attachment" rows="1" first="0"> 
    
<a href="/setup/own/deleteredirect.jsp?delID={!attachment.ID}" onclick="confirmation4()">Delete</a>

<img src="{!URLFOR($Action.Attachment.Download, attachment.Id)}"/>
</apex:repeat>

and I was able to delete with no issues. But with keeping this same code in my Enterprise Production Trial it doesn't seem to work. I highlighted the delete link in the listview to get the URL and created this link:

<a href="/setup/own/deleteredirect.jsp?id={!Member__c.id}&delID={!attachment.ID}">Del.</a>

but I keep getting an error message saying "The attempted delete was invalid for your session. Please confirm your delete." and then there's a delete link right below but I click on it and nothing happens.

Any ideas? I'm stuck.... Thanks!