Where is the button that invokes the popup (or the script, respectively)?
If the click is invoked with jQuery you can do
That preventDefault function prevents the default action, i. e. the link going somewhere.
On the other hand, since the anchor isn’t linking anywhere anyway (as I assume by you saying that it jumps to the top which sounds like you have an
) you would be better off just removing that attribute altogether. Why have a link that’s not linking anything?