How to add a floating-fixed button

It is very easy method. Just add this code in a HTML gadget. Gadget position in not important.

<a style="display:scroll;position:fixed;center:5px;right:5px;" href="TARGET WEBPAGE LINK" title="SOME TEXT HERE"><img src="IMAGE LINK" /></a>

To control the position change "center:5px;right:5px" numbers.
And done.