Onmouseover Event Function For Dom Created Div

I have written some dom code to create a list of divs, each with it's
own id. I want to set the onmouseover and onmouseout events to
highlight the div when the mouse is over it. However I cannot use the
method below because oDiv.id is always set to the last div I create -
so the last div is highlighted regardless of which div I am onmouseover
This must be a common issue, how do I go about fixing it?

I can have a separate function which takes event.srcElement and tracks
back through the parent elments until it finds a div with an id
starting with "entry_" but I was hoping for an easier option.

Is this something to do with closures?

Here's a much simplified example :

for( nIndex=0; nIndex<aEntries.length; nIndex++)
{
oEntry = aEntries[nIndex];

oDiv = document.createElement( "div");
oDiv.id = "entry_" + oEntry.uniquename;
oDiv. {document.getElementById(
oDiv.id).className = "hover";};
oDiv. {document.getElementById(
oDiv.id).className = "";};

oBody.appendChild( oDiv)
}