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JAVASCRIPT AJAX Custom button ,related list

I created a custom button which executes JAVASCRIPT, Depending on whether a detail is present i need to display error message/redirect user.
Is there a way to get the list of related list in JAVASCRIPT without writing a query.
Say for eg;if my JS is on Lead object if i say
lead_record.id = "{!Lead.Id}";
i could get ID directly Similar is there a way to get related lists?
[i could also create a rollup summary and check for this,but want to avoid creation of fields]