var browser     = '';
		var version     = '';
		var entrance    = '';
		var cond        = '';
		// BROWSER
		if (browser == ''){
		if (navigator.appName.indexOf('Microsoft') != -1)
		browser = 'IE'
		else if (navigator.appName.indexOf('Netscape') != -1)
		browser = 'Netscape'
		else browser = 'NN';
		}
		// VERSION?
		if (version == ''){
		version= navigator.appVersion;
		paren = version.indexOf('(');
		whole_version = navigator.appVersion.substring(0,paren-1);
		version         = parseInt(whole_version);
		}
		// BROWSER & VERSION
		if (browser == 'IE' && version >= 4) entrance = 'yes';
		if (browser == 'IE' && version < 4) entrance = 'no';
		if (browser == 'Netscape' && version >= 2.02) entrance = 'yes';
		if (browser == 'Netscape' && version < 2.02) entrance = 'no';
		if (entrance=='yes'){

//definicje przyciskow przeniesione zostaly do html'a

//		name0a=new Image;name0a.src="ico/start1.gif"; i tak dalej

		}
		function lighten(imgName) {
		if (entrance == 'yes'){
		imgOn = eval(imgName + 'b.src');
		document[imgName].src = imgOn;
		}
		}
		function darken(imgName) {
		if (entrance == 'yes'){
		imgOff = eval(imgName + 'a.src');
		document[imgName].src = imgOff;
		}
		}
		function darken2(imgName) {
		if (entrance == 'yes'){
		imgClick = eval(imgName + 'c.src');
		document[imgName].src = imgClick;
		}
		}