Singled out the "View Comments" logic into a function

- when the icon is pressed, comments are now loaded automatically
- while comments are loading, a load GIF is shown
- modified fixit.css to add new rules for loader GIF
Minor fix to use paraID in new comment submit form
Made the content div static in size and overflow

- when it overflows, it shows a vertical scroll bar
- the size is fixed to the height of the whole comment box
Added loader GIF file