HTML onclick dropdown menu - html

Question

I have to code the button below when its clicked it will display a dropdown menu.
How would I approach this as I have never come across this before.

Answer 1

<style type="text/css">
<!--
body,td,th {
font-family: Verdana, Geneva, sans-serif;
font-size: 100%;
color: #666;
}
body {
background-color: #fff;
margin-left: 20px;
margin-top: 20px;
margin-right: 20px;
margin-bottom: 20px;
}
a, a:hover, a:active, a:focus {
outline:0;
direction:ltr;
}
.wrapper {
position:relative; height:25px;
}
.mainmenu {
position:absolute;
z-index:100;
font-family:Verdana, Geneva, sans-serif;
font-weight:normal;
font-size:90%;
line-height:25px;
left:50%;
margin-left:-303px;
width:606px;
}
ul.menu {
padding:0;
margin:0;
list-style:none;
width:100px;
overflow:hidden;
float:left;
margin-right:1px;
}
ul.menu a {
text-decoration:none;
color:#fff;
padding-left:5px;
}
ul.menu li.list {
float:left;
width:250px;
margin:-32767px -125px 0px 0px;
background:url(images/top1.png) no-repeat left bottom;
}
ul.menu li.list a.category {
position:relative;
z-index:50;
display:block;
float:left;
width:120px;
margin-top:32767px;
background:transparent;
}
ul.menu li.list a.category:hover,
ul.menu li.list a.category:focus,
ul.menu li.list a.category:active {
margin-right:1px;
background-image:url(images/tophover1.png);
background-repeat:no-repeat;
background-position:left top;
}
ul.submenu {
float:left;
padding:25px 0px 0px 0px;
margin:0;
list-style:none;
background-image:url(images/tophover1.png);
background-repeat:no-repeat;
background-position:left top;
margin:-25px 0px 0px 0px;
}
ul.submenu li a {
float:left;
width:120px;
background:#369;
clear:left;
}
ul.submenu li a.endlist {
background:url(images/bottom1.png);
}
ul.submenu li a.endlist:hover,
ul.submenu li a.endlist:focus,
ul.submenu li a.endlist:active {
background:url(images/bottomhover1.png);
}
ul.submenu a:hover,
ul.submenu a:focus,
ul.submenu a:active {
background:#900;
margin-right:1px;
}
-->
</style>
<div class="wrapper">
<div class="mainmenu">
<ul class="menu">
<li class="list">
<a class="category" href="#Home">Home</a>
</li>
</ul>
<ul class="menu">
<li class="list">
<a class="category" href="#about">About Us »</a>
<ul class="submenu">
<li>About link 1</li>
<li>About link 2</li>
<li>About link 3</li>
<li>About link 4</li>
<li><a class="endlist" href="#about5">About link 5</a></li>
</ul>
</li>
</ul>
<ul class="menu">
<li class="list">
<a class="category" href="#articles">Articles »</a>
<ul class="submenu">
<li>Articles link 1</li>
<li>Articles link 2</li>
<li>Articles link 3</li>
<li><a class="endlist" href="#articles4">Articles link 4</a></li>
</ul>
</li>
</ul>
<ul class="menu">
<li class="list">
<a class="category" href="#news">News »</a>
<ul class="submenu">
<li>News link 1</li>
<li>News link 2</li>
<li><a class="endlist" href="#news3">News link 3</a></li>
</ul>
</li>
</ul>
<ul class="menu">
<li class="list">
<a class="category" href="#donate">Donate</a>
</li>
</ul>
<ul class="menu">
<li class="list">
<a class="category" href="#contact">Contact</a>
</li>
</ul>
<!-- end mainmenu --></div>
<!-- end wrapper --></div>
or try this link
http://www.texaswebdevelopers.com/blog/template_permalink.asp?id=129
or
http://www.1stwebdesigner.com/css/38-jquery-and-css-drop-down-multi-level-menu-solutions/

Answer 2

I agree with Jerome C.
The only seggestion I can give you, is that usually there are many sites whose title is "the best NNN dropdownmenus" or substitute dropdownmenus with whatever.
Thery are usually helpful.
In such case:
http://www.hongkiat.com/blog/drop-down-menu-30-free-scripts-to-enhance-header-navigation/