There is only one easy way to do this, and it works only if the page you want to save have tags (in HTML its written with <a name="tagName">), then you can refer to the specific tag with the file name and #tagname after it.
Another (harder) way to do so is with a bit of java script bypass. just copy the following line as a new bookmark address, change URL to the page address (leave the apostrophe (') there) and change the number (1000) to the number of pixels from the top of the page:
javascript:window.location.href='URL'; scrollTo(0,1000);
it's a bit of a complex, but it should work.
