I dont see why it wont work on vb4, unfortunately I haven't got my vb4 test site running at present
You can set the bar to show earlier or later when the page is scrolled down by altering one number in the above code. Something I forgot to mention in the original integration
In the footer code, alter this line
PHP Code:
bar_show_below : 150
Edit the 150 to make it show earlier or later