Q:

scrolling in same page

I would like to do the same as what is here
In this site there is top static menu some if i click download ,it will take me to scroll page.
How to do this?

A:

To do something like that site, put the contents of your site in <div>s and set their id attributes. Then, do something like this to scroll to a specific div.
For the Javascript/jQuery stuff, you can either bind to each <a> element's click event, or you can just specify the onclick="goToByScroll('insertMyDivIdHere')" attribute in the HTML.
Edit:
To keep the navigation menu visible at all times, fix its position on the page. Here's the CSS  uses to accomplish this:
#top-bar-menu {
    -moz-box-shadow: 0 1px 5px #210634;
    background: none repeat scroll 0 0 #501E73;
    border-bottom: 1px solid #300B4C;
    float: left;
    font-size: 15px;
    height: 24px;
    left: 0;
    line-height: normal;
    list-style: none outside none;
    margin: 0;
    padding: 9px 0 3px;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 95;
}

