The Anchor.y property yields the pixel distance of the anchor from the top edge of the document. The vertical position of the object in the display is measured in pixels. You can use the x and y coordinates of the object as targets of the scrollTo() method for the window it lives in.
This is not supported by MSIE. Instead you can use the offsetTop property that is inherited from the Element object super-class. There may be some occasions when this is not an exact equivalent value though.