The parent-object

Hi there..

Is it possible to get a referance to the parent of an object??

Say you got this:
<Div ID='X'>
<Div ID='Y'>

</Div>
</Div>
Where X is the parent of Y.

I would like a function like this:

function getParent(obj){
return(obj.Parent)
}

Can that be?

Thanks in advance
Ronnie