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function full_reset(form) {
cost_per_unit.innerHTML = ""
charge_per_unit.innerHTML = ""
}

function addEvent(els, type, func) {
	if(!(els instanceof Array)) els = [els];
	for(var i=0, n=els.length; i<n; ++i) {
		if(els[i].addEventListener) els[i].addEventListener(type, func, false);
		else els[i].attachEvent("on"+type, func);
	}
}

String.prototype.trim = function() {
	return this.replace(/^\s+/, "").replace(/\s+$/, "");
};

var quantity = document.getElementById("quantity");
var cost = document.getElementById("cost");
var charge = document.getElementById("charge");
var profit_amount = document.getElementById("profit_amount");
var profit_percent = document.getElementById("profit_percent");
var tax = document.getElementById("tax");
var cost_per_unit = document.getElementById("cost_per_unit");
var charge_per_unit = document.getElementById("charge_per_unit");
var subtotal = document.getElementById("subtotal");
var discount = document.getElementById("discount");
var discount_amount = document.getElementById("discount_amount");
var total = document.getElementById("total");
var dpp = document.getElementById("dpp");
var dpa = document.getElementById("dpa");
var dcc = document.getElementById("dcc");
var dt = document.getElementById("dt");
var dst = document.getElementById("dst");

addEvent(
	[cost, charge],
	"keyup",
	function(e) {
		var vcost = cost.value.trim(); var vcharge = charge.value.trim();
		var ncost = vcost*1; var ncharge = vcharge*1;
		if(vcost=="" || vcharge=="" || isNaN(ncost) || isNaN(ncharge)) {
			profit_amount.value = profit_percent.value = "";
			return;
		}
		prof = (ncharge - ncost).toFixed(2)
		
		profit_amount.value = prof;
		profit_percent.value = (prof/ncharge*100).toFixed(2);
		discount.value = ""
		dcc.innerHTML = "";
    dt.innerHTML = "";
    dst.innerHTML = "";
    dpa.innerHTML = "";
    dpp.innerHTML = "";
	}
);
addEvent(
 [cost, profit_percent],
 "keyup",
 function(e) {
   var vcost = cost.value.trim(); var vprofit_percent = profit_percent.value.trim();
   var ncost = vcost*1; var nprofit_percent = vprofit_percent*1;
   if(vcost=="" || vprofit_percent=="" || isNaN(ncost) || isNaN(nprofit_percent)) {
     profit_amount.value = "";
     return;
   }
   profit_amount.value = (ncost / nprofit_percent * 100).toFixed(2);
   charge.value = (ncost + (ncost / nprofit_percent *100)).toFixed(2);
   discount.value = "";
   dcc.innerHTML = "";
    dt.innerHTML = "";
    dst.innerHTML = "";
    dpa.innerHTML = "";
    dpp.innerHTML = "";
 }
);
addEvent(
	[cost, profit_amount],
	"keyup",
	function(f) {
		var vcost = cost.value.trim(); var vprofit_amount = profit_amount.value.trim();
		var ncost = vcost*1; var nprofit_amount = vprofit_amount*1;
		if(vcost=="" || vprofit_amount==""|| isNaN(ncost) || isNaN(nprofit_amount)) {
			profit_amount.value = "";
			return;
		}
		profit_percent.value = (nprofit_amount / (ncost + nprofit_amount) * 100).toFixed(2);
		charge.value = (ncost + nprofit_amount).toFixed(2);
	}
);


addEvent(
 [quantity, cost, charge, profit_amount, profit_percent],
 "keyup",
 function(e) {
   var vquantity = quantity.value.trim(); var nquantity = vquantity*1;   
   var vcharge = charge.value.trim(); var ncharge = vcharge*1;
   var vcost = cost.value.trim(); var ncost = vcost*1;
   var vprofit_amount = profit_amount.value.trim(); var nprofit_amount = vprofit_amount*1;
   var vprofit_percent = profit_percent.value.trim(); var nprofit_percent = vprofit_percent*1;
    if(vquantity=="" || vcharge=="" ||  vcost=="" || vprofit_amount=="" || vprofit_percent=="" || isNaN(nquantity) || isNaN(ncharge) || isNaN(ncost) ||  isNaN(nprofit_amount) || isNaN(nprofit_percent)) {
      profit_amount.value = profit_percent.value = "";
      return;
    }
    tax.value = (ncharge * 0.08375).toFixed(2);    
    cost_per_unit.innerHTML = "$" + (ncost / nquantity).toFixed(2) + "/per unit";
   charge_per_unit.innerHTML = "$" + (ncharge / nquantity).toFixed(2) + "/per unit";
   subtotal.value = (ncharge + (ncharge * 0.08375)).toFixed(2);
   discount.value = ""
   dcc.innerHTML = "";
    dt.innerHTML = "";
    dst.innerHTML = "";
    dpa.innerHTML = "";
    dpp.innerHTML = "";
   
 }
);
addEvent(
 [discount],
 "keyup",
 function(e) {
   var vcost = cost.value.trim();
   var ncost = vcost*1;
   var vdiscount = discount.value.trim();
   var ndiscount = vdiscount*1/100;
   var vcharge = charge.value.trim();
   var ncharge = vcharge*1;
   var vprofit_amount = profit_amount.value.trim();
   var nprofit_amount = vprofit_amount*1;
   var vquantity = quantity.value.trim();
   var nquantity = vquantity*1;
   var vsubtotal = subtotal.value.trim();
   var nsubtotal = vsubtotal*1;
   off = (ncharge * ndiscount).toFixed(2)
   dcharge = (ncharge - off).toFixed(2)
   dtax = (dcharge * 0.08375).toFixed(2)   
   dsub = (nsubtotal - off).toFixed(2)
   dprof = (dcharge-ncost).toFixed(2)
   dper = (dprof/ncharge*100).toFixed(2)

   // tax.value = (tax.value * ndiscount).toFixed(2);    

   discount_amount.innerHTML = off;
    dcc.innerHTML = "<strong>$"+ dcharge + "</strong> ($"+ (dcharge / nquantity).toFixed(2) +"/per unit)";
    dt.innerHTML = "<strong>$"+ dtax + "</strong>";
    dst.innerHTML = "<strong>$"+ dsub + "</strong>";
    dpa.innerHTML = "<strong>$"+ dprof + "</strong>";
    dpp.innerHTML = "<strong>"+ dper + "%</strong>";
   
 }
);