* U.S. stocks rally but pare gains on Geithner worries
* Dollar tumbles versus yen as UK bank woes slam sterling
* U.S. debt pares losses, euro bond yields hit record low
* Crude hovers at $41 a barrel as slowdown crushes demand (Recasts with U.S. markets, changes dateline; previous LONDON)
By Herbert Lash
NEW YORK, Jan 21 (Reuters) - U.S. stocks gained on Wednesday, supported by a solid outlook from bellwether IBM, but were off their highs on concerns that a government rescue program will take longer than anticipated.
U.S. Treasuries and the dollar both fell, while overseas equity markets closed lower on fears over the outlook for banks.
The U.S. dollar fell to a session low against the yen as benchmark U.S. stock indexes pared gains and briefly turned negative. The pound tumbled to its lowest since 1985 against the dollar as British banking woes weighed.
European shares fell on deepening fears that major financial institutions would not survive the credit crisis, while signs of mounting job losses highlighted the depth of a still worsening economic slowdown across the euro zone.
Investors in Europe rushed to buy the safest and most liquid fixed-income assets, sending two-year euro zone government bond yields to historic lows.
Tough questions during a U.S. Senate hearing on Treasury secretary designate Timothy Geithner raised doubts about his confirmation, leading Wall Street to shed some early gains.
"Geithner said Obama's economic plan will come in the next few weeks' and I think people are hoping for an immediate package now. But the fear is that it could take it could take two to three months," said Bret Barker, a portfolio manager at Metropolitan West Asset Management in Los Angeles.
Around 1 p.m., the Dow Jones industrial average <
> was up 98 points, or 1.24 percent, at 8,047.30. The Standard & Poor's 500 Index <.SPX> was up 11.6 points, or 1.44 percent, at 816.82. The Nasdaq Composite Index < > was up 22 points, or 1.55 percent, at 1,463.64.International Business Machines Corp <IBM.N> contributed the most to the Dow's gain, jumping 8.7 percent. The world's top technology services company reported a quarterly profit and gave a 2009 profit outlook that surpassed expectations.
Financial shares advanced as investors hunted for bargains in a sector hard hit by losses resulting from the credit crunch and worries of more to come.
JPMorgan Chase & Co <JPM.N> jumped almost 11 percent and ranked among the Dow's top advancers.
European shares fell for the tenth session in the last 11 as a relief rally among battered banking shares failed to offset declines in other sectors, notably energy.
The FTSEurofirst 300 <
> index of top European shares fell 0.9 percent to close at a two-month low of 767.23, pulled down by energy stocks despite a rise in crude oil prices.British banks pared steep losses despite concerns they may need more government aid or be nationalized.
Barclays <BARC.L> fell 9.3 percent, after being down more than double that, and Lloyds Banking Group <LLOY.L> ended the session up 0.7 percent after falling as much as 26 percent.
However, banking troubles left many investors unnerved. The recapitalization of ailing Royal Bank of Scotland blew out the British deficit to its highest on record in December.
"There's so much uncertainty about banks being nationalized and the effect this would have on governments' balance sheets, and credit ratings," said Cazenove strategist Elin Anden. "There are too many macro worries to encourage buying shares."
The prospect that more dramatic intervention may be needed as euro zone economies tip into recession tugged a European banks index to a 16-year low and pushed the yield on two-year German government debt to as low as 1.409 percent <EU2YT=RR>.
The dollar fell against a basket of major currencies, with the U.S. Dollar Index <.DXY> down 0.30 percent at 86.12. Against the yen, the dollar <JPY=> was down 2.05 percent.
The euro <EUR=> fell 0.09 percent at $1.2876.
The pound fell as low as $1.3622 <GBP=>, its lowest since September 1985.
"The UK financial system is in tatters," said Ron Simpson, director of currency research at Action Economics in Tampa, Florida. "We have not seen a bottom for sterling."
U.S. Treasury bond prices fell as hopes for some economic recovery undercut the bid for safe-haven U.S. government debt.
The cost of the government's plans for pulling the United States from recession and restore confidence in U.S. banks weighed on Treasuries because it would boost their supply.
The benchmark 10-year U.S. Treasury note <US10YT=RR> fell 17/32 to yield 2.43 percent. The 30-year U.S. Treasury bond <US30YT=RR> in price to yield 3.06 percent.
Oil hovered around $41 a barrel, as further evidence emerged of a deepening global slowdown that is crushing demand for fuel.
U.S. light sweet crude oil <CLc1> rose 80 cents to $41.64 per barrel.
Spot gold prices <XAU=> fell $3.70 to $852.10 an ounce.
Ongoing trouble in the financial sector and worrisome economic data knocked Asian shares down, with the MSCI index of Asia-Pacific stocks outside Japan <.MIAPJ0000PUS> falling 1.7 percent and Japan's Nikkei average <
> sliding 2 percent. (Reporting by Leah Schnurr, Ellen Freilich, Nick Olivari and Gertrude Chavez-Dreyfuss in New York, Jamie McGeever, David Sheppard and Brian Gorman in London and Brian Rohan in Berlin; writing by Herbert Lash; Editing by Dan Grebler)