function na_change_img_src(name, nsdoc, rpath, preload) {
		var img = eval((navigator.appName.indexOf('Netscape', 0) != -1) ? nsdoc+'.'+name : 'document.all.'+name);
		if (name == '') return;
		if (img) {
			img.altsrc = img.src;
			img.src    = rpath;
		}
	}