//Check the email address entered to see if it is at least in the proper format.
function check_email(emailaddress) {
	if (emailaddress.indexOf("@") == -1 || emailaddress.indexOf("@") == 0 || emailaddress.indexOf("@.") == 0 || emailaddress.indexOf(".") == -1) {
		return false;
	}
	else {
		return true;
	}
}

function ltrim(string_to_ltrim) {
	for (var i = 0; i < string_to_ltrim.length && string_to_ltrim.charAt(i) == ' '; i++);
	return string_to_ltrim.substring(i);
}

function rtrim(string_to_rtrim) {
	for (var i = string_to_rtrim.length; i > 0 && string_to_rtrim.charAt(i - 1) == ' '; i--);

	return string_to_rtrim.substring(0, i);
}

function trim(string_to_trim) {
	return ltrim(rtrim(string_to_trim));
}

//Check if the current character is a letter a -> z or A -> Z
//Returns true or false.
function isLetter(character) {
	if ((character >= "a" && character <= "z") || (character >= "A" && character <= "Z")) {
		return true;
	}
	else {
		return false;
	}
}

//Check if the current character is a number 0 -> 9
//Returns true or false.
function isDigit(character) {
	if ((character >= "0") && (character <= "9")) {
		return true;
	}
	else {
		return false;
	}
}

//Returns true if character is a letter or digit.
function isLetterOrDigit(char_string) {
	blnIs = true;
	for (i = 0; i < char_string.length; i++) {
		//Check if the current character is a letter or number.
		//If one character fails, pass back false. Otherwise, pass back true.
		var c = char_string.charAt(i);
		if (!isLetter(c) && !isDigit(c)) {
			blnIs = false;
		}
	}
	return blnIs;
}