SVG Elements - hover effect and z-index

Hi

Im trying to use SVG to create something similar to the attached graphic. Essentially they are a collection of categories symbolised by the circles. Each cartegory/circle has a lot of textual information associated with it that is shown when the circle is clicked.  This data is stored in a DB. Also there is a hover effect that shows a snippet of data(as seen on graphic)

I have created the following as a quick test:
https://www.app-cessories.co.uk/canvas/zoom/demo/paultest3.html

If you hover on top left circle it enlarges to depict the hover effect. How can i change the z-index of this? it currently sits below the adjacent circle and should be on top...

Also, do you think SVG is the best method to try and tackle this task? i did attempt html5 canvas but couldn't access each circle individually which i will need to do to be able to retrieve data from a database that is shown when each circle is clicked

Thanks
coolispaulAsked:
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GaryConnect With a Mentor Commented:
$('body').on('mouseover', '#circle1', function () {
$hoverText.show();
$(this).appendTo("#svg_ID") // add an ID to the svg.
$(this).css('transform', 'translate(-100px,-50px) scale(2)');
}); 

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GaryCommented:
You cannot with z-index.
You could with jquery change the element order - i.e. on hover move that circle to be the last element in the block - this is assuming you will be doing the same for the other circles...
...if not then just move it to the end.
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coolispaulAuthor Commented:
how do i move it with jquery?
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