I'm receiving this error using the following javascript code:

function tempTest(evt) {

    alert(evt.currentTarget.id);

    ct = document.getElementById(evt.currentTarget.id);

    rslt = document.getElementById('rslt');

    var props;

    for (var prop in ct) {

        if (ct.hasOwnProperty(prop)) {

            propVal = ct[prop];

            var propDat = prop + ' = ' + propVal;

            props += propDat + '<br/>';

        }

    }

    rslt.innerHTML = props;

}

This one has me puzzled. Any ideas?