var SearchBox = new Class(
{
    Implements: [Events],
    initialize: function(id) {

        this.Text = 'Enter search term and hit enter.';

        this.InputBox = $(id);
        this.InputBox.value = this.Text;

        this.InputBox.addEvent('keydown', function(e) {
            if (e.code == 13)
                window.location.href = "search.aspx?criteria=" + this.InputBox.value;
        } .bind(this));

        this.InputBox.addEvent('click', function() {
            this.InputBox.value = '';
        } .bind(this));

        this.InputBox.addEvent('blur', function() {
            this.InputBox.value = (this.InputBox.value == '') ?
                this.InputBox.value = this.Text :
                this.InputBox.value;
        } .bind(this));
    }
});