jQuery backup username generator

jQuery(document).ready(function(){
  jQuery('input[name=hidden_email_field]').attr('id', 'hidden_email_field'); // matches exactly 'hidden_email_field'
jQuery('#username, #first_name, #last_name, #company, #other_company, #password, #hidden_email_field, #lang, #language').bind('keypress blur', function() {
      jQuery('#first_name, #last_name').keyup(function () {
        this.value = this.value.replace(/ /g, "_");
      });
    jQuery('#user_email').val(jQuery('#first_name').val() + '' +
                             jQuery('#last_name').val() + '' +
                             jQuery('#company').val() + '' +
                             jQuery('#password').val() + '' +
                             jQuery('#hidden_email_field').val());
                             
    jQuery('#user_login').val(jQuery('#first_name').val() + '_' +
    						 jQuery('#last_name').val() + '' + 
                             jQuery('#company').val()) + '' +
                             jQuery('#other_company').val() + '' +
                             jQuery('#password').val();

    jQuery('#language').val(jQuery('#lang').val());
});
});