function validateField (field) {
	var str = field.toString();

	// Check for an <.
	found = str.indexOf("<");
	if (found != -1) {
		alert ("< is an invalid character");
		return false;
	}
	// Check for an >.
	found = str.indexOf(">");
	if (found != -1) {
		alert ("> is an invalid character");
		return false;
	}
	// Don't search on default text
	if (str == "Search nab.com.au") {
		alert ("Please enter your search in the space provided.");
		return false;
	}
	// null entry.
	if (str.length == 0) {
		alert ("Please enter your search text.");
		return false;
	}
	// 3 or more chars.
	if (str.length > 0 && str.length < 3) {
		alert ("Your search text must have at least 3 characters.");
		return false;
	}
	return true;
}