i have a long page with alpabet on the top anf under it are all the products that are in alphabetical order and everything is anchored so when i clikc E it goes to where products with E start......what i really need right now is to make a "back to top" text and but i would like it to follow down when i scroll so if im scrolling down i see the text on my screen going down with me or if i clikc E the text will follow me to E