function rollover() {
	if (document.getElementById && document.createTextNode){
	
	var areas=document.getElementsByTagName('IMG');
	for (var i=0;i<areas.length;i++)
		{
			if (areas[i].className != 'norollover') {			
			areas[i].onmouseover=function () {this.src='images/listen2.gif';;return false}
			areas[i].onmouseout=function () {this.src='images/listen.gif';return false}			
			}
		}
	}
}