var oCal = frm1.getCalendar("REG_DATE"); //
//oCal.attachEvent("onChange", function(date, state){
oCal.attachEvent("onClick",function(date){
// do sth
});
var oCal = frm1.getCalendar("REG_DATE"); //
//oCal.attachEvent("onChange", function(date, state){
oCal.attachEvent("onClick",function(date){
// do sth
});