How to calculate decimal values

[LeeHarvey2011]

need to calculate decimal values

example 42.925181855342466 + 58.64

but i get this $58.64$42.93, i know js is easy on int values, but funny with floats
any help would be great...after some quick helper code...so i can move on.

Esanda.prototype.calculateFornightCharge = function(payIndex,dueIndex)
	{
		var oThis = this;
		alert("Pay index" +  " " + payIndex + " " + "Due index" + " " + dueIndex);
		var pi = (payIndex-1);
		var di = (dueIndex-1);
		alert("Pay index" +  " " + pi + " " + "Due index" + " " + di);
		var pay = this.oTable.rows[pi].cells[6].innerHTML;
		var due = this.oTable.rows[di].cells[6].innerHTML;
		alert("Due:" + oThis.dollarize(due));
		alert("Due:" + oThis.dollarize(pay));
		var charge = (oThis.dollarize(pay) + oThis.dollarize(due));
		alert( charge );
	}

[Logic_Ali]

Try

var charge = oThis.dollarize( Number( pay ) + Number( due ) );

[LeeHarvey2011]

Day Date Event Debit Credit Balance DailyRate
0 Mon-8-Nov-2010 Opening 20356.6 7.33
1 Tue-9-Nov-2010 14.66
2 Wed-10-Nov-2010 21.990000000000002
3 Thu-11-Nov-2010 29.32
4 Fri-12-Nov-2010 36.65
5 Sat-13-Nov-2010 43.980000000000004
6 Sun-14-Nov-2010 51.31
7 Mon-15-Nov-2010 58.64

8 Tue-16-Nov-2010 Payment 500.00 19856.6 7.154196975890411
9 Wed-17-Nov-2010 14.308393951780822
10 Thu-18-Nov-2010 21.462590927671233
11 Fri-19-Nov-2010 28.616787903561644
12 Sat-20-Nov-2010 35.77098487945206
13 Sun-21-Nov-2010 42.925181855342466
14 Mon-22-Nov-2010 Due Date

Okay why is it that when i calculate 7.33 * 8 = 58.64 and 7.15 * 6 = 42.92

58.64 + 42.92 = 101.56
totalcharge = 101.56
fee = 2.31
total = 103.87

but i noticed on my real world statment the charge is 101.60 + fee = 103.91

how do i get javascript to produce this 103.91 value

i had the same problem with excel but it has a advanced feature called set precision as displayed, how can i get javascript to do it too...

	Esanda.prototype.calculateFornightCharge = function(payIndex,dueIndex)
	{
		var fee = 2.31;
		var oThis = this;
		var pi = (payIndex-1);
		var di = (dueIndex-1);
		var pay = this.oTable.rows[pi].cells[6].innerHTML;
		var due = this.oTable.rows[di].cells[6].innerHTML;
		var charge = (parseFloat(pay) + parseFloat(due));
		var final = (charge + fee);
		alert(oThis.dollarize(final));
	}