function bookmark() {
	var ver = navigator.appName
	var num = parseInt(navigator.appVersion)
	if ((ver == "Microsoft Internet Explorer")&&(num >= 4)) {
	   window.external.AddFavorite("http://www.nettrafficsecrets.com/","Best Internet Traffic Information");
	}else{
	   alert("You are not using Internet Explorer. \n Please, press Ctrl + D to bookmark this site");
	} 
}

function popupwin(filename) {
	var iMyWidth;
	var iMyHeight;
	//gets top and left positions based on user's resolution so hint window is centered.
	iMyWidth = (window.screen.width/2) - (300 + 10); //half the screen width minus half the new window width (plus 5 pixel borders).
	iMyHeight = (window.screen.height/2) - (170 + 50); //half the screen height minus half the new window height (plus title and status bars).
	var win2 = window.open(filename,"","status=no,height=340,width=600,resizable=no,left=" + iMyWidth + ",top=" + iMyHeight + ",screenX=" + iMyWidth + ",screenY=" + iMyHeight + ",scrollbars=yes");
	win2.focus();
}