function init_bw_images() {
  if (document.getElementById('products_list').className=='web') {
    var elems = document.getElementsByTagName('a');
    for (var i=0; i<elems.length; i++) {
      if (/(bw)/i.test(elems[i].className)) {
        elems[i].swap_handler = swap_image;
        addEvent(elems[i], 'mouseover', 'swap_handler');
        addEvent(elems[i], 'mouseout', 'swap_handler');
      }
    }
  }
}
window.initBwHandler = init_bw_images;
addEvent(window, 'load', 'initBwHandler');
function swap_image() {
	var img = this.getElementsByTagName('img');
	if (img[0]) {
		var name = img[0].src;
		if (/_bw/.test(name)) {
			img[0].src = img[0].src.replace("_bw", "");
		} else {
			img[0].src = img[0].src + '_bw';
		}
	}
}