Right, I've just started working on my portfolio website, and trying to pick up CSS as I go. I've searched and tried numerous ways of doing this, but haven't found a way that seems to work. I need to be able to make these two divs centre the page. This is the relevant code that I have at the moment, assuming it is correct!?
This is what it looks like at the moment, but I just need the whole lot centred.
Please could the response be explained as much as possible!?

[+] Click To Enlarge
Thanks.
Code:
#navleft {
height: auto;
width: 200px;
background-color: #333333;
margin-right: 10px;
margin-top: 15px;
text-align: left;
padding-top: 15px;
padding-right: 10px;
float: left;
padding-bottom: 15px;
padding-left: 10px;
}
#contentright {
float: left;
height: auto;
width: 560px;
background-color: #333333;
padding-top: 15px;
padding-right: 10px;
padding-bottom: 15px;
padding-left: 10px;
max-height: 90%;
margin-top: 15px;
text-align: left;
max-width: 560px;
}
This is what it looks like at the moment, but I just need the whole lot centred.
Please could the response be explained as much as possible!?

[+] Click To Enlarge
Thanks.