function displayspan(sList){
    if(!document.getElementById) return false;
    
    //set all to off
    clearAll();
    //turn some back on
    sList += "";
    var ids=sList.split(/\s*,\s*/);
    for (id=0; id<ids.length; id++) {
        span = document.getElementById("tab"+ids[id]);
        span.style.display = "block";
    }

}
function clearAll() {
    var spans = document.getElementById("type").getElementsByTagName("span");
    for(i = 0; i < spans.length; i++){spans[i].style.display = "none";}
}