Master detail - add new

Dear All,

I'd like to create a master - detail (project and project tasks) page, and there is one issue I am not able to solve.

I've created the detail NewItem.aspx that expects the ID of the master record. Now I need a dynamic "add new" link under the details webpart that contains the Master_ID as parameter.

My questions:

1. how can I remove the default "add new" link?

2. What is the correct syntax? I need something like this:

<a href="../../SitePages/New_ProjTask.aspx?Proj_ID={@Proj_ID}">Add new project tasks</a>

Thanks in advance!