jQuery(document).ready(function(){
	if (!jQuery('#btn-subscribe')) {
		return;
	}

	jQuery('#btn-subscribe').attr('disabled', 'disabled');
	var formFields = [
		'fld_name',
		'fld_surname',
		'fld_country',
		'fld_city',
		'fld_street',
		'fld_zip',
		'fld_activation_code',
		'fld_email'
	];

	var tmr = setInterval(function() {
			var enableSubmit = true;
			for (i in formFields) {
				var fieldID = formFields[i];
				if (jQuery('#' + fieldID)[0] && !jQuery('#' + fieldID).val()) {
                	enableSubmit = false;
					break;
				}
			}

			if (enableSubmit) {
				jQuery('#btn-subscribe').attr('disabled', '');
			}
			else {
            	jQuery('#btn-subscribe').attr('disabled', 'disabled');
			}
		},
		500
	);
});