function getBrowserVersion() {
		appname= navigator.appName;
		appversion = navigator.appVersion;
		majorver = appversion.substring(0, 1);
		if ( (appname == "Netscape") && ( majorver >= 3 ) ) return 1;
		
		if ( (appname == "Microsoft Internet Explorer") && (majorver >= 4) ) return 1;
			return 0;
		}
		
		function switch_image(num, imgname) {
			if (getBrowserVersion()) {
				document[imgname].src = img[num].src;
			}
		}

		
		imagesrc = new Array();
		imagesrc[0] = "img/logo/isobarBw.jpg";
		imagesrc[1] = "img/logo/isobarColor.jpg";
		imagesrc[2] = "img/logo/iprospectBw.jpg";
		imagesrc[3] = "img/logo/iprospectColor.jpg";
		imagesrc[4] = "img/logo/marvellousBw.jpg";
		imagesrc[5] = "img/logo/marvellousColor.jpg";
		imagesrc[6] = "img/logo/suddenlyBw.jpg";
		imagesrc[7] = "img/logo/suddenlyColor.jpg";
		imagesrc[8] = "img/logo/distBw.jpg";
		imagesrc[9] = "img/logo/distColor.jpg";
		imagesrc[10] = "img/logo/caratBw.jpg";
		imagesrc[11] = "img/logo/caratColor.jpg";
		imagesrc[12] = "img/logo/insightBw.jpg";
		imagesrc[13] = "img/logo/insightColor.jpg";
		imagesrc[14] = "img/logo/vizeumBw.jpg";
		imagesrc[15] = "img/logo/vizeumColor.jpg";
		imagesrc[16] = "img/logo/jjpBw.jpg";
		imagesrc[17] = "img/logo/jjpColor.jpg";
		imagesrc[18] = "img/logo/lentusBw.jpg";
		imagesrc[19] = "img/logo/lentusColor.jpg";
		imagesrc[20] = "img/logo/domingoBw.jpg";
		imagesrc[21] = "img/logo/domingoColor.jpg";
		
		
		if (getBrowserVersion()) {
			img = new Array();
			for (i = 0; i < imagesrc.length; i++) {
				img[i] = new Image();
				img[i].src = imagesrc[i];
			}
		}