HTML5 placeholder polyfill

placeholder.js

    if (!Modernizr.input.placeholder) {
        // Old IE doesn't support the placeholder attribute on <input>
        // TODO: placeholder colour and remove when submitting form
        $(function() {
            $('input[placeholder]').each(function() {
                var ths = $(this), placeholder = ths.attr('placeholder');
                if (!ths.val()) {
                    ths.val(placeholder);
                }
                ths.focus(function() {
                    if (ths.val() === placeholder) {
                        ths.val('');
                    }
                }).blur(function() {
                    if (!ths.val()) {
                        ths.val(placeholder);
                    }
                });
            });
        });

    }