function calculate(bReverse) {
     var select1 = document.curconvert.covertfrom;
     var select2 = document.curconvert.covertto;
     var select1_text = select1[select1.selectedIndex].text;
     var select2_text = select2[select2.selectedIndex].text;
     var fromval;
     var toval;

     //these error messages are hidden values in the templates
     //they get translated into foreign languages
     var errmsg1 = "An error has occurred with this selection. Please select two currencies and try again.";
     var errmsg2 = "Please enter a valid amount.";

     if (fromval == null && toval == null)			
     {
 	 fromval = rate[select1[select1.selectedIndex].value];
     	 toval = rate[select2[select2.selectedIndex].value];
     }
	 
	if (fromval == null || toval == null)
	{
		document.curconvert.amount2.value="0.00";
		return true;
	}

	 if (fromval == "" || toval == "" || isNaN(fromval) || isNaN(toval)) {
		alert(errmsg1);
		return false;
     }
     if (bReverse)
		var amount = removecommas(document.curconvert.amount2.value); 
	else
		var amount = removecommas(document.curconvert.amount.value);

	 if (isNaN(amount)){ 
	 	alert(errmsg2);
		document.curconvert.amount.focus();
		return false;
	}
     var pattern = /,/g;
     amount = amount.replace(pattern, "");

  	showConversion(fromval, toval, amount, bReverse);
  	
  	setCookie("szCurrTo", select2[select2.selectedIndex].value);
  	setCookie("szCurrToTxt", select2[select2.selectedIndex].text);
}

function lastupdate() {
     if ((navigator.appName.indexOf("Netscape") != -1)&& (parseInt(navigator.appVersion) == 4)) {
			paintNSCP();
     } 
	 else if ((navigator.appName.indexOf("Microsoft") != -1) || 
	 		  (parseInt(navigator.appVersion) >= 5)){
			paintDOM();
    } 
	calculate();
}

function paintNSCP() {
     document.layers['lastupdate'].document.write('<NOBR><SPAN CLASS="lastupdate">'+lastupdate );
     document.layers['lastupdate'].document.close();
}

function paintDOM() {
	 var value = lastdate;
	 	 
     if (document.createTextNode){
	 	if(document.getElementById("lastupdate_ie").hasChildNodes()){
			oText = document.getElementById("lastupdate_ie").firstChild;
			if (oText.nodeType == 3)
				oText.nodeValue = value;
			else return false;
		}
		else{
		 	var results=document.createTextNode(value);
			document.getElementById("lastupdate_ie").appendChild(results);
			
		}
	  }
}

function showConversion(fromval, toval, amount, bReverse) {
	var totval;
	if (bReverse)
	{
		totval = amount * fromval/toval;
		document.curconvert.amount.value=toCurrency(totval);
	}
	else
	{
		totval = amount * toval / fromval;
		document.curconvert.amount2.value=toCurrency(totval);
	}
}

function round(num) {
	var x = num * 10000;
	return (Math.round(x) / 10000);
}

function removecommas(amount)
{
  var length=amount.length;
  var s=amount.toString();
  var returnval = "";
  for (var i=0;i<=length;i++) {
	if (amount.substr(i, 1)!=',')
		returnval=returnval+amount.substr(i, 1);
	}
  return returnval;
}

function toCurrency(num) {
	num = round(num);
	var currstring = num.toString();
	if (currstring.match(/\./)) {
		var curr = currstring.split('.');
	} else {
		var curr = [currstring, "00"];
	}
	curr[1] += "00";
	curr[2] = "";
	var returnval = "";
	var length = curr[0].length;

	// add 0 to decimal if necessary
	for (var i = 0; i < 2; i++)
		curr[2] += curr[1].substr(i, 1);

	// insert commas for readability
	for (i = length; (i - 3) > 0; i = i - 3) {
		returnval = "," + curr[0].substr(i - 3, 3) + returnval;		
	}
	returnval = curr[0].substr(0, i) + returnval + "." + curr[1].substr(0, 4);
	return (returnval);
}


function setCookie(name, value)
{
	var curCookie = name + "=" + escape(value) +"; expires=Fri, 29 Jan 2010 00:00:00 UTC";
	document.cookie = curCookie;
}