I have a menu in HTML with submenus that are displayed when hovering over the main button, but I would like to know if it is possible to make the submenus appear when **click** on the button.

```css
*Configurações Padrões*/ ul.menu,
.menu li,
.menu a {
  margin: 0;
  padding: 0;
  list-style: none;
  text-decoration: none;
}

ul.menu ul {
  position: absolute;
  display: none;
}

ul.menu {
  float: left;
  font-family: Verdana, Geneva, sans-serif;
  font-size: 15px;
  padding: 0 5px;
  margin: 0px -8px;
  width: 100%;
  position: fixed;
  bottom: 0;
}

/* Configurações nivel 1*/

.menu li {
  float: left;
  width: auto;
  position: relative;
}

.menu li a {
  display: block;
  padding: 0 20px;
  line-height: 45px;
  height: 45px;
  float: left;
}

/* Configurações nivel 2*/

.menu li:hover>ul.submenu-1 {
  display: block;
  top: -145px;
  left: 0;
  padding: 5px;
  width: 200px;
}

.menu ul.submenu-1 a {
  width: 160px;
  padding: 0 20px;
}

/* Configurações nivel 2*/

.menu li:hover>ul.submenu-2 {
  display: block;
  top: 0;
  left: 135px;
  padding: 5px;
  width: 200px;
}

.menu ul.submenu-2 a {
  width: 140px;
  padding: 0 20px;
}

/* Configurações nivel 3*/

.menu li:hover>ul.submenu-3 {
  display: block;
  top: 0;
  left: 195px;
  padding: 5px;
  width: 200px;
}

.menu ul.submenu-3 a {
  width: 160px;
  padding: 0 20px;
}

/*Configurações de cores*/

/*nivel 1*/

.menu {
  background: #CCC;
}

.menu a {
  color: #000;
}

.menu li:hover>a {
  background: #999;
  color: #fff;
}

/*nivel 2*/

.submenu-1 {
  background: #999;
}

.submenu-1 a {
  color: #fff;
}

.submenu-1 li:hover>a {
  background: #666;
}

/*nivel 3*/

.submenu-2 {
  background: #666;
}

.submenu-2 a {
  color: #fff;
  margin-top: -4px;
}

.submenu-2 li:hover>a {
  background: #333;
}

/*nivel 3*/

.submenu-3 {
  background: #333;
}

.submenu-3 a {
  color: #fff;
}

.submenu-3 li:hover>a {
  background: #000;
}

.menuul li:hover,
ul li.active {}
```

```html
<ul class="menu">
  <li><a href="#">Iniciar</a>

    <ul class="submenu-1">
      <li><a href="#">Submenu 1</a>

        <ul class="submenu-3">
          <li><a href="#">Submenu 7</a></li>
          <li><a href="#">Submenu 8</a></li>
          <li><a href="#">Submenu 9</a></li>
        </ul>

      </li>
      <li><a href="#">Submenu 2</a></li>
      <li><a href="#">Submenu 3</a></li>

      <ul class="submenu-2">
        <li><a href="#">Submenu 4</a></li>
        <li><a href="#">Submenu 5</a></li>
        <li><a href="#">Submenu 6</a></li>
      </ul>
  </li>
  </ul>
  </li>
</ul>
```

I need something like the windows98 style button of this site:
<http://osrollers.tumblr.com/>