I don't know what is your reason for wanting to disable tool-tips but I've run into the same problem myself.
I was trying to create a bubble tool-tip in CSS but the browser tool-tip would always appear and mess things up. So, like you, I needed to disable the default tool-tip.
I used a bit of jQuery to remove the "Title" tag but only on mouse hover. As soon as the mouse is out, the "Title" tag is restored.
Following is a DIV with some "Title" content:
This is a test
Now, you will have to run the following jQuery to hide the Title tag on mouse hover:
$(document).ready(function(){
$(".tooltip-class").hover(function(){
$(this).attr("tooltip-data", $(this).attr("title"));
$(this).removeAttr("title");
}, function(){
$(this).attr("title", $(this).attr("tooltip-data"));
$(this).removeAttr("tooltip-data");
});
});
Note that this jQuery code was tested in an environment with jQuery Version 1.6.4.
Following is a link to the full example:
http://jsfiddle.net/eliasb/emG6E/54/