JQuery :: Replace The Default Tooltip Of All Title Elements?

I need different definitions of tooltip on one page: 1/ Replace the default tooltip of all title elements

$('*[title]').tooltip({
delay: 500
});

AND

2/ Replace only Title elements within class "fast" (e.g. <a class="fast" href="..." title="fast tooltip">Fast</a> )

$('*[title].fast').tooltip({
delay: 0
});

But first definition overrides the second one all the time. I moved "general" definition 1/ on the first position of js and the "class based" 2/ on the last one but no success.