function onFormSubmit (frmThisForm) {
	var strErrMsg = "";
	
	if (frmThisForm.txtModelNumber.options[frmThisForm.txtModelNumber.selectedIndex].value == "") {
		strErrMsg += "Please select a Model Number.\n\n";
	}
	
	if (frmThisForm.txtSerialNumberA.value == "" || frmThisForm.txtSerialNumberB.value == "" || frmThisForm.txtSerialNumberC.value == "" || frmThisForm.txtSerialNumberD.value == "") {
		strErrMsg += "Serial Number has not been properly entered.\n\n";
	}
			
	if (frmThisForm.txtAccountName.value == "") {
		strErrMsg += "Last Name should not be empty.\n\n";
	}
	if (frmThisForm.txtAccountFirstName.value == "") {
		strErrMsg += "First Name should not be empty.\n\n";
	}
	if (frmThisForm.txtStreet.value == "") {
		strErrMsg += "Street address should not be empty.\n\n";
	}
	if (frmThisForm.txtCity.value == "") {
		strErrMsg += "City should not be empty.\n\n";
	}
	
	if (frmThisForm.txtStateProvince.options[frmThisForm.txtStateProvince.selectedIndex].value == "") {
		strErrMsg += "Please select a State/Province.\n\n";
	}
	
	if (!CheckPostalZipCode(frmThisForm.txtZipPostalCode.value)) {
		strErrMsg += "Please enter your postal/zip code.\n\n";
	}
	
	if (frmThisForm.txtCountryRegion.options[frmThisForm.txtCountryRegion.selectedIndex].value == "") {
		strErrMsg += "Please select a Country/Region.\n\n";
	}
	
	if (!CheckPhoneNumber(frmThisForm.txtPhoneAreaCode.value, frmThisForm.txtPhoneFirstThree.value, frmThisForm.txtPhoneLastFour.value)) {
		strErrMsg += "Please enter your phone number. i.e. (506) 555-5555\n\n";
	}
	
	/*
	if (!CheckEmail(frmThisForm.txtEmail.value)) {
		strErrMsg += "Please enter a valid email address.\n\n";
	}
	*/
	
	// Not a required field.  Remove whitespace. If not blank, test for proper phone number formatting.
	var tempFax = frmThisForm.txtFaxAreaCode.value + frmThisForm.txtFaxFirstThree.value + frmThisForm.txtFaxLastFour.value;
	if (tempFax.replace(/\s/g, "") != ""){
		if (!CheckPhoneNumber(frmThisForm.txtFaxAreaCode.value, frmThisForm.txtFaxFirstThree.value, frmThisForm.txtFaxLastFour.value)) {
			strErrMsg += "Please enter your Fax number. i.e. (506) 555-5555\n\n";
		}
	}
	
	if (!isDate(frmThisForm.txtPurchaseMM.value + "/" + frmThisForm.txtPurchaseDD.value + "/" + frmThisForm.txtPurchaseYYYY.value)) {
		strErrMsg += "Please enter a purchase date. i.e. 06/15/2008\n\n";
	}

	if (frmThisForm.txtBuildingAge.value == "") {
		strErrMsg += "Building age should not be empty.\n\n";
	}	

	if (frmThisForm.txtDealer.value == "") {
		strErrMsg += "Dealer's name should not be empty.\n\n";
	}

	if (frmThisForm.txtInstalledBy.options[frmThisForm.txtInstalledBy.selectedIndex].value == "") {
		strErrMsg += "Please select who installed the unit.\n\n";
	}
	
	if (strErrMsg != "") {
		window.alert(strErrMsg);
		strErrMsg = "";
	}
	else {
		frmThisForm.submit();
	}
}

function CheckPostalZipCode(strPcode) {
	var rePostal = /^([a-zA-Z]\d[a-zA-Z]\s?\d[a-zA-Z]\d|\d{5})$/g;
	if (strPcode.match(rePostal)) {
		return true;
	}
	else {
		return false;
	}
}

function CheckPhoneNumber(intAreaCode, intFirst3, intLast4) {
	var bolOK = false;
	var reAlNums = /^\d+$/;
	
	if ((intAreaCode.length == 3) && intAreaCode.match(reAlNums)) {
		if ((intFirst3.length == 3) && intFirst3.match(reAlNums)) {
			if ((intLast4.length == 4) && intLast4.match(reAlNums)) {
				bolOK = true;
			}
		}
	}
	
	return bolOK;
}

function CheckEmail(strEmail) {
	var reEmail = /^.+\@.+\..+$/;
	
	if (strEmail.match(reEmail)) {
		return true;
	}
	else {
		return false;
	}
}

/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this;
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12);
	var pos1 = dtStr.indexOf(dtCh);
	var pos2 = dtStr.indexOf(dtCh,pos1+1);
	var strMonth = dtStr.substring(0,pos1);
	var strDay = dtStr.substring(pos1+1,pos2);
	var strYear = dtStr.substring(pos2+1);
	var strYr = strYear;
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1);
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1);
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1);
	}
	var month = parseInt(strMonth);
	var day = parseInt(strDay);
	var year = parseInt(strYr);
	if (pos1==-1 || pos2==-1){
		//alert("The date format should be : mm/dd/yyyy");
		return false;
	}
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Please enter a valid month");
		return false;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Please enter a valid day");
		return false;
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear);
		return false;
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Please enter a valid date");
		return false;
	}
	return true;
}
// Javascript to switch the CSS hide on and off in the Serial Number example
function showStuff(id) {
	document.getElementById(id).style.display = 'block';
}
function hideStuff(id) {
	document.getElementById(id).style.display = 'none';
}