dropdown menu เลือกบางเมนู เมนูอื่นไม่สามารถคลิกได้ครับ

  <div class="navbar-collapse collapse ">
                  <ul class="nav navbar-nav">
                      <li class="active"><a href="home.php">หน้าหลัก</a></li>
                      <li class="dropdown">
                          <a href="#" class="dropdown-toggle " data-toggle="dropdown" data-hover="dropdown" data-delay="0" data-close-others="false">เกี่ยวกับโครงการ<b class=" icon-angle-down"></b></a>
                          <ul class="dropdown-menu">
                              <li><a href="rationale.php">หลักการและเหตุผล</a></li>
                            <li><a href="purpose.php">วัตถุประสงค์</a></li>
                              <!-- <li><a href="lecturer.php">ประวัติวิทยากร</a></li> -->
                              <li><a href="schedule.php">กำหนดการ</a></li>
                          </ul>
                      </li>
                      <li class="dropdown">
                          <a href="#" class="dropdown-toggle " data-toggle="dropdown" data-hover="dropdown" data-delay="0" data-close-others="false">ลงทะเบียน<b class=" icon-angle-down"></b></a>
                          <ul class="dropdown-menu">
                              <li><a href="regisname.php">รายชื่อผู้ลงทะเบียน</a></li>
                            <li><a href="regis.php">ลงทะเบียน</a></li>

                          </ul>
                      </li>
                      <li><a href="contact.php">ติดต่อสอบถาม</a></li>
                  </ul>
              </div>

header .navbar {
    margin-bottom:0;
}

.navbar-default {
	border: 1;
  /*  border: none; */

}

.navbar-brand {
    color: #222;
		text-transform: uppercase;
    font-size: 24px;
    font-weight: 700;
    line-height: 1em;
		letter-spacing: -1px;
    margin-top: 30px;
    padding: 0 0 0 15px;
}


header .navbar-collapse  ul.navbar-nav {
    float: right;
    margin-right: 0;
}

header .navbar-default{
    background-color: #fff;
}

header .nav li a:hover,
header .nav li a:focus,
header .nav li.active a,
header .nav li.active a:hover,
header .nav li a.dropdown-toggle:hover,
header .nav li a.dropdown-toggle:focus,
header .nav li.active ul.dropdown-menu li a:hover,
header .nav li.active ul.dropdown-menu li.active a{
    -webkit-transition: all .3s ease;
    -moz-transition: all .3s ease;
    -ms-transition: all .3s ease;
    -o-transition: all .3s ease;
    transition: all .3s ease;
}


header .navbar-default .navbar-nav > .open > a,
header .navbar-default .navbar-nav > .open > a:hover,
header .navbar-default .navbar-nav > .open > a:focus {
    -webkit-transition: all .3s ease;
    -moz-transition: all .3s ease;
    -ms-transition: all .3s ease;
    -o-transition: all .3s ease;
    transition: all .3s ease;
}


header .navbar {
    min-height: 00px;
}

header .navbar-nav > li  {
    padding-bottom: 30px;
    padding-top: 30px;
}

header  .navbar-nav > li > a {
    padding-bottom: 6px;
    padding-top: 5px;
    margin-left: 2px;
    line-height: 30px;
	font-weight: 700;
    -webkit-transition: all .3s ease;
    -moz-transition: all .3s ease;
    -ms-transition: all .3s ease;
    -o-transition: all .3s ease;
    transition: all .3s ease;
}


.dropdown-menu li a:hover {
    color: #fff !important;
}

header .nav .caret {
    border-bottom-color: #f5f5f5;
    border-top-color: #f5f5f5;
}
.navbar-default .navbar-nav > .active > a,
.navbar-default .navbar-nav > .active > a:hover,
.navbar-default .navbar-nav > .active > a:focus {
  background-color: #fff;
}
.navbar-default .navbar-nav > .open > a,
.navbar-default .navbar-nav > .open > a:hover,
.navbar-default .navbar-nav > .open > a:focus {
  background-color:  #fff;
}


.dropdown-menu  {
    box-shadow: none;
    border-radius: 0;
	border: none;
}

.dropdown-menu li:last-child  {
	padding-bottom: 0 !important;
	margin-bottom: 0;
}

header .nav li .dropdown-menu  {
   padding: 0;
}

header .nav li .dropdown-menu li a {
   line-height: 28px;
   padding: 3px 12px;
}

/* --- menu --- */

header .navigation {
	float:right;
}

header ul.nav li {
	border:none;
	margin:0;
}

header ul.nav li a {
	font-size:12px;
	border:none;
	font-weight:700;
	text-transform:uppercase;
}

header ul.nav li ul li a {
	font-size:12px;
	border:none;
	font-weight:300;
	text-transform:uppercase;
}


.navbar .nav > li > a {
  color: #111;
  text-shadow: none;
}

.navbar .nav a:hover {
	background:none;
}

.navbar .nav > .active > a,.navbar .nav > .active > a:hover {
	background:none;
	font-weight:700;
}

.navbar .nav > .active > a:active,.navbar .nav > .active > a:focus {
	background:none;
	outline:0;
	font-weight:700;
}

.navbar .nav li .dropdown-menu {
	z-index:2000;
}

header ul.nav li ul {
	margin-top:1px;
}
header ul.nav li ul li ul {
	margin:1px 0 0 1px;
}
.dropdown-menu .dropdown i {
	position:absolute;
	right:0;
	margin-top:3px;
	padding-left:20px;
}

.navbar .nav > li > .dropdown-menu:before {
  display: inline-block;
  border-right: none;
  border-bottom: none;
  border-left: none;
  border-bottom-color: none;
  content:none;
}



ul.nav li.dropdown a {
	z-index:1000;
	display:block;
}

 select.selectmenu {
	display:none;
}