If you have a gridview/repeater control or other tabular data within a div, scroll bar appears when height of data gets bigger than that of DIV.
If you want to scroll down to a certain position, you can use 'Element.scrollTop' property in Javascript:
document.getElementById(divWithScroll').scrollTop = PixelsToScroll;
Calculating the PixelsToScroll may vary depending on scenerio,
In my case, I wanted to scroll down to a selected row within Repeater control. Row was selected using RadioButton and page was reloaded on selection of RadioButton. So, I saved the SelectedItem.ItemIndex in Repeater_ItemDataBound in a hidden field and using the value in Javascript like following:
PixelsToScroll = SelectedItem * 22;
where 22 is height of table row