Below is the javascript  code i am using

function confirmDelete()
       {
           var returnValue = window.confirm("Deleting the current
page. Continue?");
           return returnValue;

//            var returnValue = $find('mdlPopUpExt').show();
//            return returnValue;
       }

I like to do the same thing using modal popup. I like to return true
or false according to the button clicked in the panel for modal popup.

Thanks,
Arnab