100% height for a absoulutely positioned child div - css

I'm making a navigation where the children will be showed in a different box, much like http://www.boffi.com/EN/Collections/bathrooms/b14.aspx . I managed to separate the child using absolute positioning, but can't get the child elements background to have a 100% height. it's a list element, so if I put height: 100% , the bottom two main navigation elements dissapears. Please help! Here's my html:
<ul id="mainmenu">
<li id="liHome" class="active">
Home
</li>
<li id="liServices" class=" ">
Services
<div class="child">
<ul style="" id="SubMenuY2" class="submenu">
<li>Sub-item 1</li>
<li>Sub-item 2</li>
</ul>
</div>
</li>
<li id="liEnvironment">
Environment
</li>
<li id="liCareer">
Career
</li>
<li id="liContact">
Contact
</li>
</ul>
and the css
body, html{
height:100%;
}
#mainmenu{
background:black;
color: white;
width:130px;
position:relative;
top:0;
height:100%
}
#mainmenu li a {
color:white;
}
ul.submenu{
position:absolute;
background:blue;
width:130px;
}
div.child{
position:relative;
margin-left:130px;
}
Thanks a lot for the help.

I simplified your code a little.. well I actually just removed the div with class="child", as you don't really need it.
Then, all I did was this:
ul.submenu{
position:absolute;
left: 130px; top: 0;
background:blue;
width:130px;
height: 100%;
}
Take a look at the fiddle: http://jsfiddle.net/joplomacedo/rqqju/
Was this what you were looking for?

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To keep things simple, I have reduced your code to a bare minimum.
I'm not sure exactly how you want it to look, but here's a possible solution.
When making css only menu's I try to stick to a nested list of <ul> and <li>'s.
This makes it clearer to read, and keeps the semantics in order.
Ther is no need for container divs within. (like the <div class="dropdown_content"> in your code)
The HTML is a nested list. Initially we hide the nested ul, and only show it when it's parent is hovered over. By using .dropDown li:hover>ul you only target the ul that is DIRECTLY under the hovered li. That way you dan nest as deep as you want.
.dropDown ul {
display: none;
position: absolute;
background: white;
border: 1px solid red;
}
.dropDown li:hover>ul{
display: block;
}
<ul class="dropDown">
<li>Game order
<ul>
<li>Half-life</li>
<li>Half-life 2</li>
<li>Half-life EP1</li>
</ul>
</li>
<li>Portal series</li>
<li>Half Life Alyx</li>
<li>deeper nesting
<ul>
<li>level 1</li>
<li>more here
<ul>
<li>level 2</li>
<li>more here
<ul>
<li>level 3</li>
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</li>
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</li>
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</li>
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I tried with following
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This is my code
The HTML code is
<body>
<div id="nav">
<ul id="menu1">
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<li>Section 2</li>
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<li><img src"image.png" alt=""/></li>
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{
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{
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text-decoration:none;
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float:right;
margin-top:35px;
margin-left:10px;
margin-right:10px;
}
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Already, the code for inserting the image is not good :
<img src="image.png" alt=""/>

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<li><a href="#"></li>
<li><a href="#"></li>
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Please try below css code.
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<nav class="listfirst">
<ul>
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<li>Foo</li>
</ul>
</nav>
you have to specify:
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}
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<li>
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<li>
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thanks
Luca
just set the parent li's position to relative; #nav-list li{position:relative}
i did it up on jsfiddle for ya, fyi i took out the margin-left on the #nav-list just so its more clear.
http://jsfiddle.net/jalbertbowdenii/deVYx/

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