function toggle( targetId ) {
   if ( document.getElementById ) {
    target = document.getElementById( targetId );
    if ( target.style.display == "none" ) {
     target.style.display = "";
    } else {
     target.style.display = "none";
    }
   }
}

function swap(imageId) {
if(document.getElementById) {
if(document.getElementById(imageId).src.indexOf('toggle-arrow.gif')>-1) {
document.getElementById(imageId).src = "expand-arrow.gif";
} else {
document.getElementById(imageId).src = "toggle-arrow.gif";
}
return false;
} else {
return true;
}
}