The dollar was on the back foot against the euro and slipped against the Aussie on Friday after a big euro short squeeze ahead of U.S. jobs data, while the yen lost ground all round as the squeeze spilled into Asian trade.

The Australian dollar AUD=D4 rose half a U.S. cent and climbed against the low-yielding Japanese currency after Australia's government announced a watered-down version of a proposed mining tax, easing concerns it could hurt business investment and share prices.

The dollar has fast lost favour this week, undermined by concerns about the strength of the U.S. economy, and it plunged on Thursday, hitting its lowest this year against the yen, as short-covering by euro bears unleashed a chain reaction.

The dollar index .DXY, a gauge of its performance against six other major currencies, hovered just above a two-month low after it shed 1.6 percent on Thursday, while the greenback staggered up against the yen after hitting a seven-month low of 86.96 yen JPY= in the fray.

But it faced selling at 88 yen, with the market on alert for any comments from Japanese authorities which might signal concern about yen strength.

This is broad-based dollar sales. It's not risk aversion -- rather dollar aversion, said Masafumi Yamamoto, chief FX strategist Japan at Barclays in Tokyo.

The U.S. Labor department releases its June employment report at 1230 GMT. Economists are forecasting a loss of 110,000 jobs in June compared with an increase of 431,00 jobs in May.

A negative surprise could weigh further on the dollar, after soft economic numbers in recent sessions sent investors worried about a double-dip recession into safe-haven U.S. Treasury bonds and pushed yields down.

Dealers said Japanese importer buying of the dollar ahead of the three-day weekend in the U.S. helped lift it 0.5 percent to 88.04 yen JPY=, but its drop through 87.95 on Thursday, when options triggers sent it down, meant it had broken below the 95-88 yen range held so far this year.

One dealer said more options triggers lay below 85 yen. The dollar fell to a 14-year low of 84.82 last November.

The euro made its big move against the dollar on Thursday, surging more than 2 percent to $1.2541 in its biggest one-day advance since mid-March last year, and on Friday it was holding steady above $1.2500 EUR= at its highest levels in five weeks.

Charts indicate it faces near-term resistance at $1.2570, a 38.2 percent retracement of its decline from $1.3692 in April to $1.1876 in early June. Resistance could also come in at its 55-day moving average around $1.2550.

It was steady at 1.3281 Swiss francs EURCHF=R after hitting a record low 1.3073 on Thursday, and its gains on Friday came instead against the yen, where it rose 0.4 percent to 110.16 yen.

The yen also lost sharply to the Australian and New Zealand dollars, with the Aussie up 0.7 percent at 74.71 yen AUDJPY=R and the kiwi gaining 1 percent to 61.10 yen NZDJPY=R as short-term speculators covered short positions.

By later in the Asian session the Aussie had given up early gains against the dollar made after the mining tax news, with traders saying activity had fallen away as the jobs data neared.

It was steady at $0.8477 AUD=D4 after rising as far as $0.8510.

Tony Morriss, a senior FX strategist at ANZ, said the mining tax news was positive for the Aussie particularly in the short run as it removed some uncertainty weighing on the currency.

But we have to see how it holds up, given the U.S. payrolls coming up and a long weekend in the U.S., Morriss said. (Additional reporting by Anirban Nag in Sydney and Rika Otsuka and Hideyuki Sano in Tokyo; Editing by Michael Watson)

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