Ruby on Rails

I have a section of controller code that tries to style a page with
moving text and images.
This used to work a few years ago, but I have not had the site working
for awhile and I am trying to resurrect it.
Below is some of the RJS code. The z-index and font-size does not seem
to work as far as I can tell, though I am especially focused on z-
index not working. My moving text is supposed to be in front of the
images, but it is not.
If I do view generated source from web developer plugin, one of the
elements generated is shown below. I am not sure if my problem may be
something different in RJS or CSS is needed or what else I can try to
troubleshoot the problem ? I am using rails 3.0.5 at the moment ..
thanks

page[k].set_style :'font-size' => font_sz
page[k].set_style :color => col
page[k].set_style :position => 'absolute'
page[k].set_style :left => 40 + (horz)
horz = horz + spacing + (w.length * mult)
page[k].set_style :top => (tidx * 100) + 70
page[k].set_style :'z-index' => 20
page[k].visual_effect effect, {:queue=> {:position =>
'end', :scope => scope}, :duration => 1}

some of the dynamic css generated:

<span id="sp0_0" style="color: purple; position: absolute; left: 40px;
top: 70px; overflow: visible;">Free</span>

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