Get Advance Find FetchXml on Ribbon button click

Got a requirement which needs to get advance find fetch xml on a ribbon button.

Here is the script to get advance find FetchXml on ribbon button click

function getAdvfindXml()

{
var fetchXml = document. all.namedItem("FetchXml").value;
alert(fetchXml);

}

Use the advance find xml accordingly.

Hope helps :)

Note: Above script completely unsupported.