var current = 3;

function textSize(current, change){
    current = current + change;
    if(current > 6){
        current = 6;
    }
    else if(current < 0){
        current = 0;
    }
    document.getElementById("textSizeCSS").href = "wp-content/themes/bethel/text" + current + ".css";
    return current;
}