cronometro.js

var start;
var finish;
jQuery(function ($) {
	start = new Date();

    $('form').submit(function(){

    finish= new Date();
	var tiempo = (+finish - +start) / 1000;
	jQuery("#landing_form").append('<input type="hidden" name="session_time" value="'+tiempo+'" />');

    $('input[type=submit]', this).attr('disabled', 'disabled');

    swal({
      text: "Espera por favor, estamos validando tus datos de registro...",
      icon: "http://www.hullvanhire.co.uk/public/themes/vanhire/images/loading.gif",
      button: false,
      closeOnEsc: false,
      closeOnClickOutside: false,
      closeOnConfirm: false,
      closeOnCancel: false
    });

    
    $('body').keypress(function(event){
      if (event.keyCode == 10 || event.keyCode == 13) 
        swal({
          text: "Espera por favor, estamos validando tus datos de registro...",
          icon: "http://www.hullvanhire.co.uk/public/themes/vanhire/images/loading.gif",
          button: false,
          closeOnEsc: false,
          closeOnClickOutside: false,
          closeOnConfirm: false,
          closeOnCancel: false
        });
    });
    
  });

  });