How to call javascript function from Jquery function?

How to call javascript function from Jquery function?

Hello,

$(function() {
$("#changeTicketNumber").keyup(function(e) {
  var textValue = $(this).val();
          if(trimAll(textValue) == null || trimAll(textValue).length == 0)
        {
          alert("Please enter change id or incident id",'error');
             return;                          
        }   
           if(e.keyCode == 13){             
               validateCHSTicketNumber1(); // in IE it is showing object expected error.
           }
});
});

For me i have to enter some value in text box and click enter button to submit it.So here in Mozilla working fine.In IE8 '  validateCHSTicketNumber1(); ' it is not able to call and telling Object expected error (script error).
How can i resolve this issue?

Thank you.