$(document).ready
                 ( 
                    function()
                    {   
                        $("#landingZipCartForm\\:submit").hide();
 $("#landingForm_zipCode").keydown(function(e)
                        {
                          if(e.keyCode == 13)
                            {
                              subclick();	 
                                 return false;
                            }
                        }
                      );
                         
$('#landingZipCartForm').submit(function() {
 return validateZip();
});
                       
                        
                    }
                );

                function isNumberKey(evt)
                {
	        	var charCode = (evt.which) ? evt.which : evt.keyCode;
			if (charCode == 13){return false;}
		     
                    if (charCode > 31 && (charCode < 48 || charCode > 57))
                        {return false;}
                    return true;
                }

    function validateZip()
    {
      if ($("#landingForm_zipCode").val().length < 5) 
         {
            alert("Please enter your delivery zip code");
            return false;
         } else{
            return true;
         }
    }



               
    function subclick()
    { 
       var obj = document.getElementById("landingZipCartForm:submit");
           
          obj.click();
    }