I have the following code:
I found this to work the best for me. I send the Google Translate "origninal text" tooltip to z-index: -1000. So it is still in the page, but out of sight.
// Force hiding of "original text" popup for menus, etc. (very annoying)
jQuery(selector).bind(
"mouseenter mouseleave",
function (event) {
if (event.type === 'mouseenter') { google_trans_tt.css('z-index', -1000); }
else { google_trans_tt.css('z-index', 1000); }
}
);