Format currency in javascript

Experts,

I have a formatCurrency function that I need to enhance.  I need it to be able to do the following:

If a user enters a H or h after a number, then multiply that number so it is formatted in the hundreds
If a user enters a T or t after a number, then multiply that number so it is formatted in the thousands
If a user enters a M or m after a number, then multiply that number so it is formatted in the milions

for example,

5m = 5,000,000
3T = 3,000

My function right now strips out characters.  I need it to not strip out those characters mentioned above and format it.

function formatCurrency(fld, curPrefix) {
	//Get rid of any thing other than numbers and decimal places.
 
	if(fld.value == ""){
	}
	else
	{
		num = fld.value;
		num = num.toString().replace(/[^0-9.]/g,'');
		if(isNaN(num)) num = "0";
		sign = (num == (num = Math.abs(num)));
		num = Math.floor(num*100+0.50000000001);
		cents = num%100;
		num = Math.floor(num/100).toString();
		if(cents<10)  cents = "0" + cents;
		for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++) {
			num = num.substring(0,num.length-(4*i+3))+','+
				num.substring(num.length-(4*i+3));
		}
 
 
		// Comment next line you do not want 2 decimal places.
		//fld.value =  ( ( (sign)?'':'-') + curPrefix + num + '.' + cents);
		//return (((sign)?'':'-') + curPrefix + num + '.' + cents);
 
		// UnComment next line you do not want 2 decimal places.
		fld.value =  (((sign)?'':'-') + curPrefix + num);
		return (((sign)?'':'-') + curPrefix + num);
	}
 
}

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