JavaScript v. 1.5 changes to rounding function question?

How has the 1.5 version of JavaScript made rounding for currency applications easier? Please see code below:

subtax contains the value of lets say 4.5678
// Old method of Java
//window.document.form1.tot1.value = "$ " + (Math.round(subtax*100)/100);
// New method of JavaScript 1.5
window.document.form1.tot1.value = "$ " + (subtax.toFixed(2));

Would the function toFixed (num of digits to round to) be my answer?
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