function initImgO() {
	var e = document.getElementsByTagName('img');
	for (var i = 0; i < e.length; i++)
		if (e[i].className == 'imgb1_off') {
			e[i].onmouseover = function() { this.className = 'imgb1_on'; };	
			e[i].onmouseout = function() { this.className = 'imgb1_off'; };	
		} else if (e[i].className == 'imgb2_off') {
			e[i].onmouseover = function() { this.className = 'imgb2_on'; };	
			e[i].onmouseout = function() { this.className = 'imgb2_off'; };	
		} else if (e[i].className == 'imgop_off') {
			e[i].onmouseover = function() { this.className = 'imgop_on'; };	
			e[i].onmouseout = function() { this.className = 'imgop_off'; };	
		}
}