var productPrices = new Array (36.9, 31, 38.9, 44.5);
var productFields = new Array ("FPC477UXY", "FLC776FPW", "FZO372NEU", "FBH392NGV");
var totalField = "FYC602LEP";
var formId = "2003";

function calcTotal() {

	var productCount = productFields.length;
	totalPrice = 0;
	fieldPrice = 0;

	for(i=0;i<productCount;i++) {

		fieldValue = document.getElementById("tx_mailform_input-item-" + formId + "-" + productFields[i]).value;
		fieldValue = parseInt(fieldValue);
		fieldPrice = fieldValue*productPrices[i];
		fieldPrice = parseFloat(fieldPrice);
		totalPrice += fieldPrice;
		//totalPrice + (totalPrice==Math.round(totalPrice) ? '.00' : '0' );
		
	}
	document.getElementById("tx_mailform_input-item-" + formId + "-" + totalField).value= totalPrice +(totalPrice==Math.round(totalPrice) ? '.00' : '0' );
}