Add Custom Filter for Lookup in Dynamics CRM

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Following is a code snippet for adding custom filter in lookup in dynamics CRM.

function onPageLoad()

{

    var LookupControl = Xrm.Page.getControl("new_marketinglist");

    if (LookupControl != null) {

        var fetchXml = "<filter type='and'><condition attribute='createdfromcode' operator='eq' value='2' /></filter>";

        LookupControl.addPreSearch(function () {

            LookupControl.addCustomFilter(fetchXml);

        });

    }

}