function formSubmit(frm) {
	if (isEmpty(frm.txtEnquirer, "Enquirer Name")) return
	if (isEmpty(frm.txtTelNum, "Contact Number")) return
	if (isEmpty(frm.txtEmail, "Email")) return
	if (notEmail(frm.txtEmail, "Email")) return
	if (isEmpty(frm.txtHotelName, "Hotel Name")) return
	if (isEmpty(frm.txtRoomType, "Room Type")) return
	if (isSelect(frm.sltRoomUnits, "Number of Units/Rooms")) return

	//submit form
	frm.submit()	
}


function isEmpty(field, fieldName) {
	if (trim(field.value) == "") {
		alert("Please enter " + fieldName + ".");	
		field.focus()
		return true
	}
	return false
}


function isSelect(field, fieldName) {
	if (field.value == "0") {
		alert("Please enter the Number of Units/Rooms.");	
		field.focus()
		return true
	}
	return false
}


function notEmail(field, fieldName) {
	var email = trim(field.value)

	if (email == "") return false

	var at = false
	var dot = false

	for (var i=0; i<email.length; i++) {
		if (email.charAt(i) == "@") at = true
		if (email.charAt(i) == "." && at) dot = true
	}

	if (!(at && dot && email.length > 5)) {
		alert("The " + fieldName + " you entered is not a valid e-mail address.")
		field.focus()
		field.select()
		return true
	}

	//check for invalid characters
	if (invalidChars(field, fieldName, ',;|\'" <>\\/')) return true

	return false
}

function invalidChars(validatedControl, validatedName, charString) {
	var validatedString = trim(validatedControl.value).toLowerCase()
	charString = charString.toLowerCase()

	for (var i=0; i<validatedString.length; i++) {
		for (var j=0; j<charString.length; j++) {
			if (validatedString.charAt(i) == charString.charAt(j)) {
				var alertString = charString.split("").join("  ")
				alertString = alertString.split("     ").join("  space  ")
				alert(validatedName + " cannot contain any of the following\nillegal characters:\n\n " + alertString)
				validatedControl.focus()
				validatedControl.select()
				return true
			}
		}
	}

	return false
}

function trim(stringToTrim) {
	var trimmedString = ""

	//left trim
	for(var i=0; i<stringToTrim.length; i++) {
		if (stringToTrim.charAt(i) != " ") break
	}

	trimmedString = stringToTrim.substring(i)

	//right trim
	for(var i=trimmedString.length-1; i>=0; i--) {
		if (trimmedString.charAt(i) != " ") break
	}

	trimmedString = trimmedString.substring(0, i + 1)

	return trimmedString
}