function init_rollover() {
    var rollAction = document.getElementsByTagName('div');
    for (var i=0; i<rollAction.length; i++) {
        var e = rollAction[i];
        if (e.className == 'segOff') {
        e.onmouseover = function () {this.className='segOver';}
        e.onmouseout = function () {this.className='segOff';}
        }
    }
}