Tooltip working in chrome but not IE

So I have a tooltip which estentially looks like this:

    a--b [tooltip="This is the tooltip I want"]

And this works perfectly in chrome and firefox but not IE which is important. When I run it from the command line it looks like this:

    <g id="node1"><title>Default tooltip</title>

    <g id="a_node1"><a xlink:title="This is the tooltip I want">

So it appears to resort to the default title tag tooltip rather than my defined one, any ideas?

For what it matters im writing it in perl with dot and graphviz then into svg. 

Thanks in advance.

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