toFixed(fractionDigits) 
toExponential(fractionDigits) 
toPrecision(precision) 

The toFixed(fractionDigits) method formats a number with fractionDigits digits after the decimal place. Suppose:

x = 1234.56789

and you call alert(x.toFixed(4)), you'll get 1234.5679 in IE5.5.

The toExponential(fractionDigits) method formats a number with fractionDigits digits after the decimal place, in exponential notation. Suppose:

x = 1234.56789

and you call alert(x.toExponential(2)), you'll get 1.23e+3 in IE5.5.

The toPrecision(precision) method formats a number with total precision number of digits, in exponential notation if needed. Suppose:

x = 1234.56789

and you call alert(x.toPrecision(2)), you'll get 1.2e+3 in IE5.5.

When you call alert(x.toPrecision(9)), you'll get 1234.56789 in IE5.5

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