Default Empty Report Parameters

I have a report created with a "Name" parameter. In my query, I have:

Name LIKE '%'+@Name+'%'

If I go to the View tab and click the OK button and leave that field blank, it loads all values. How can I make it load immediately without having to click the OK button? If I put a default value of anything in the name field, it automatically loads - why does it not do it with an empty default? Is there any way around this?

Thanks!