Link to new page in Dropdown menu Best Working

<form action="../"> <select onchange="window.open(this.options[this.selectedIndex].value,'_top')">
                                        <option value="">Please Select Product</option>
                                        <option value="http://www.shreejiinfotek.com" style="font-weight: bold;">nirav panchal</option>
                                            <option value="http://www.shreejiinfotek.com">nirav panchal </option>
                                    </select>
                                </form>