function isEmpty(aString)
{   return ((aString == null) || (aString.length == 0))
}

function isWhitespace(aString) {

    // Is aString empty?
    if (isEmpty(aString)) return true;
    
    // Remove all whitespace characters
	rExp = /\s/g;
	if ((aString.replace(rExp,"")) != "" ){
		return false;
	} else {
		return true;
	}
	
}