after clicking calender control,, validation for that function is done and on clicking next textbox it is showing undefined in datetextbox...

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Javascript

after clicking calender control,, validation for that function is done and on clicking next textbox it is showing undefined in datetextbox..

following is my code....

function Sdatecheck()
    {

            if (document.getElementById("<%=txtDateTo.ClientID%>").value=="")
      {
                 alert("Please Enter the Sale Date");
                 document.getElementById("<%=txtDateTo.ClientID%>").focus();
                 return false;
      }

     var gndate = document.getElementById("<%=txtDateTo.ClientID%>").value.split("/");
     var m_names = new Array("Jan", "Feb", "Mar",
"Apr", "May", "Jun", "Jul", "Aug", "Sep",
"Oct", "Nov", "Dec");
     var usedate=new Date(gndate[2],gndate[1]-1,gndate[0]);
     var today=new Date();
     var td=today.getDate();
     var gd=usedate.getDate();
     if(td==gd)
     {
     }
     else if(usedate<today)
     {
     alert("Invalid Sale Date!Enter present or future Date");
     document.getElementById("<%=txtDateTo.ClientID%>").focus();
     return false;
     }
      document.getElementById("<%=txtDateTo.ClientID%>").value = m_names[gndate[1]-1] +gndate[0];

     }