function getAppVersion(){
	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 chgImg(myNum, myName) {
	if (getAppVersion()) {
		document[myName].src = img[myNum].src;
	}
}

imgsrc = new Array();
imgsrc[0] = "images/main_grph/live.jpg";
imgsrc[1] = "images/main_grph/live2.jpg";
imgsrc[2] = "images/main_grph/top51.jpg";
imgsrc[3] = "images/main_grph/top51_on.jpg";
imgsrc[4] = "images/main_grph/top52.jpg";
imgsrc[5] = "images/main_grph/top52_on.jpg";
imgsrc[6] = "images/main_grph/top53.jpg";
imgsrc[7] = "images/main_grph/top53_on.jpg";
imgsrc[8] = "images/main_grph/top54.jpg";
imgsrc[9] = "images/main_grph/top54_on.jpg";
imgsrc[10] = "images/main_grph/top55.jpg";
imgsrc[11] = "images/main_grph/top55_on.jpg";
imgsrc[12] = "images/main_grph/top56.jpg";
imgsrc[13] = "images/main_grph/top56_on.jpg";
imgsrc[14] = "images/main_grph/top57.jpg";
imgsrc[15] = "images/main_grph/top57_on.jpg";
imgsrc[16] = "images/main_grph/top58.jpg";
imgsrc[17] = "images/main_grph/top58_on.jpg";
imgsrc[18] = "images/main_grph/top59.jpg";
imgsrc[19] = "images/main_grph/top59_on.jpg";

if (getAppVersion()){
	img = new Array();
	for (i = 0; i < imgsrc.length; i++){
		img[i] = new Image();
		img[i].src = imgsrc[i];
	}
}