[jQuery] How to check multiple checkboxes checked at a time

Hi,
  Is there a way to check a multiple check boxes checked at a time like.
<input type='checkbox' id="id1"/>
<input type='checkbox' id="id3"/>
<input type='checkbox' id="id9"/>
<input type='checkbox' id="id4"/>

Is there  a way to check like $("#id1,#id2,#id3").attr("checked"); should
return true if all of them is checked.

and also is there a way to return true if atleast one of them is checked
like $("#id1||#id2||#id3").attr("checked"); should return true if atleast
one id is checked. 

I'm waiting for staright response. 

Thanks in advance.
 
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