I am working on a structure to have a top navigation fixed, a left nav to be scrollable and a right nav to be fixed. 

I have created a fiddle here. just need help with the css. 

<http://jsfiddle.net/PxbX9/>

```
#header {
    position:fixed;
    background:red;
    width:700px;
    height:30px;
}
#left-block {
    float:left;
    width:350px;
    background:blue;
    height:1000px;
    margin-top:30px;
}
#right-block {
    float:left;
    width:350px;
    height:1000px;
    background:pink;
    margin-top:30px;
    .fixed-block {
        postion:fixed;
        height:1000px;
    }

```