CRM 2011 - Contact Form Loads with cannot assign to a function result onchange of a birthdate field

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  Here is the Code that Manipulates the Birthdate and Age, If age is blank I get an error with the field's customized event. I can't seem to figure out why this JavaScript is throwing the "Cannot assign to a function result" error on a Event: onchange, when this error is appearing on form load. Is there a way to Allow the code to have no action if the Birthdate field is blank?

  function birthdate_onchange()
      {
      var age = Xrm.Page.getAttribute("new_age");
      var bDay = Xrm.Page.getAttribute("birthdate");
  
      if (bDay.getValue() != null)
  
      {
          var now = new Date();
          var thisYear = now.getFullYear();
          var birthYear = bDay.getValue().getFullYear();
  
          if((bDay.getValue().getMonth()-now.getMonth())>=0)
          {
              if((bDay.getValue().getMonth()-now.getMonth())==0 && (bDay.getValue().getDate()-now.getDate())<=0)
              {
                  age.setValue(thisYear-birthYear);
              }
              else
              {
                  age.setValue(thisYear-birthYear-1);
              }
          }
          else
          {
              age.setValue(thisYear-birthYear);
          }
  
      }
      else
      {
          age.getValue()=null;
      }
      }

  I would love some feed back on this as I am new to JavaScript, but want to learn this language very much. Can provide more code or elaboration as needed, as this is just a segment of our Script for Contacts.

  Thanks,

  PGM

  Tuesday, May 20, 2014 4:05 PM