In England, when soccer fans dislike the team's performance, they taunt the coach with a cruel chant: "You don't know what you're doing."

Investors reacted in a similar manner Tuesday after newly minted Treasury Secretary Timothy Geithner unveiled an incomplete, $2 trillion plan to bail out banks. Within hours, the Dow Jones and the S&P 500 indexes each lost about 5 percent of their value — a harsh rebuke from Wall Street.

The primary features of Geithner's plan are a joint public-private fund to buy as much as $1 trillion in toxic bank assets, and a $1 trillion program to boost lending to consumers and businesses. That's separate from the $800 billion-plus economic stimulus bill working its way through Congress and last fall's $700 billion bank bailout.

The size of the Treasury rescue is massive, but officials couldn't give many details about how it will work.

For example, there was no explanation of how to value the banks' bad assets, nor how to get aid to homeowners to prevent more mortgage foreclosures. Geithner, who's been on the job for only two weeks, warned that the solutions to the credit crisis will take time. But the lack of details created the impression of another hastily conceived plan to put taxpayer dollars at irretrievable risk for questionable gain.

Taxpayers have seen the prequel, and it wasn't pretty.

Many of the banks that took the first half of the TARPbailout money don't feel obligated to say what they did with it. Wells Fargo, for example, may or may not have used some of its initial $25 billion to buy Wachovia. The government encouraged such behavior by handing out the money with few strings attached.

Geithner and President Obama vow this time will be different. They say they will insist on transparency, which should've been a basic requirement in the first go-round. They also want tougher conditions on banks receiving aid, including requiring institutions to document how the money spurred new lending. Those rules, and salary caps for CEOs, could help stamp out the largesse of some banks as they paid for corporate retreats and jets.

The package also includes $50 billion to stem mortgage foreclosures. Treasury will work with the Federal Reserve to reduce monthly mortgage payments and set up guidelines for banks to modify loans, action that is sorely needed. But Geithner didn't provide details on that plan, either, saying he will do so in a few weeks.

In an economy suffering from a widespread lack of confidence, the administration's rollout Tuesday only contributed to that mood.