How to display Approval Request links in visualforce email template related to a custom object ?

How do you get the same URLs used in HTML templates, in VisualForce templates that are not directly linked to the Approval Process Object Type ?

When sending approval requests HTML format, you have the following merge fields :

{!ApprovalRequest.Internal_URL}

{!ApprovalRequest.External_URL}

..that allow you to send direct link to the approval page, additionally to any object-related merge fields.

In my VisualForce template, I use a Custom Object as 'relatedToType' Object, so as to display merge fields linked to this object and provide extra information to the assigned approver.

<messaging:emailTemplate subject="{relatedTo.Name"} pending request from {!relatedTo.Owner.Name}"
recipientType="User"
relatedToType="MyCustomObject__c">

I would like to use these URLs in my Visualforce template, but cannot find how to set the URL with the appropriate ID parameters.

Any thoughts ?

September 20, 2011
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Ad.bayles
In the VisualForce template, the internal link would look like :

https://cs7.salesforce.com/p/process/ProcessInstanceWorkitemWizardStageManager?id=04iM00000008ghz

I am just unable to get the appropriate id parameter