How to keep the header,footer and outer div to be fixed and making the inner div scroll-able - css

Question

Please look at this http://jsfiddle.net/jaseem/sS7HN/ . What I am trying to achieve is instead of that inner scroll-bar, I want to use the main window scroll bar; SO that I can use the windows vertical scroll bar to go through the content inside the "innerContent" but at the same time I want the outer div to be fixed. is that possible ?
CSS :
header {
position: fixed;
left: 0;
top: 0;
width: 100%;
height: 50px;
}
footer {
position: fixed;
left: 0;
bottom:0;
width: 100%;
}
content {
background-color:#656565;
width: 940px;
margin:0 auto;
padding-top:10px;
border-radius:5px;
}
mainContent {
margin:0px auto;
background-color:#515151;
width:660px;
border-radius:5px;
padding-top:20px;
}
contentHolder {
margin:0 auto;
width:616px;
background-color:#000000;
border-radius:10px;
overflow:auto;
}
HTML :
<div id="header"></div>
<div id="content">
<div id="mainContent">
<div id="contentHolder"></div>
</div>
</div>
<div id="footer"></div>

Answer 1

It's a little unclear what you are trying to accomplish, but I did notice you are missing the hash tags in your CSS. You need # in front of the identifier if you are referring to an ID attribute.
Example: http://jsfiddle.net/hgcax/
CSS
#header {
position: fixed;
left: 0;
top: 0;
width: 100%;
height: 50px;
}
#footer {
position: fixed;
left: 0;
bottom:0;
width: 100%;
}
#content {
background-color:#656565;
width: 940px;
margin:0 auto;
padding-top:10px;
border-radius:5px;
}
#mainContent {
margin:0px auto;
background-color:#515151;
width:660px;
border-radius:5px;
padding-top:20px;
}
#contentHolder {
color:#fff;
margin:0 auto;
width:600px;
height: 400px;
background-color:#000000;
border-radius:10px;
overflow:auto;
}​

Answer 2

for div elements you have to give #div name here your div name is contentHolder so its #contentHolder
try like this:
#contentHolder {
overflow:auto;
}
or
#contentHolder {
overflow:scroll;
}