function isblank(s)
{
	// Thanks to Danny Goodman for this one from his book

	for(var i = 0; i < s.length; i++)
	{
		var c = s.charAt(i);
		if( (c != ' ') && (c != '\n') && (c != '\t'))
		{
			return false;
		}
	}
	return true;
}