如何在自定义的SharePoint 2007编辑表单中检索“创建者”的值

I have created a Custom Edit Form for a custom list using SharePoint designer. I need to check that the current user is the author of the list item before displaying the form as only the author should be able to edit this content. I don't have server access so want to do this in the form itself using XSL. So far, I haven't been able to retrieve the Author / Created By value. Does anyone know how to get at this value?I have created a Custom Edit Form for a custom