JQuery UI + Opera + DTD HTML 4.0 Transitional: empty horizontal line between the tabs and the tab panels

JQuery UI + Opera + DTD HTML 4.0 Transitional: empty horizontal line between the tabs and the tab panels

jquery-ui-1.7.2 introduces an empty line in Opear 10.10 between the
tabs and the tab panels when using
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
HOW TO REPRODUCE:
The index.html example page that you get when you download jquery-
ui-1.7.2 uses <!DOCTYPE html>. Just change that with <!DOCTYPE HTML
PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> and the empty
horizontal line appears in Opera 10 between the tabs and the tab
panels!
Please tell me how to eliminate the horizontal line, KEEPING <!DOCTYPE
HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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