var left = Math.max(0, (window.screen.availLeft + (window.screen.availWidth - w) / 2));
var top = Math.max(0, (window.screen.availTop + (window.screen.availHeight - h) / 2));
window.open('<c:url value="/crdn/exmnr/popup.do"/>?mode=C', 'exmnrReg', 'width=' + w + ',height=' + h + ',left=' + left + ',top=' + top + ',resizable=yes,scrollbars=yes');
var url = '<c:url value="/crdn/exmnr/popup.do"/>?mode=C'