function getParameter(param) {
	var params = location.search;
	if (params.length > 0) {
		if (params.indexOf(param) == -1) {
			return null;
		}
		param += "=";
		var start = params.indexOf(param);
		if (start != -1) {
			start += param.length;
			stop = params.indexOf('&', start);
			if (stop == -1) {
				stop  = params.length;
			}
			if (start == stop) return null;
			return params.substring(start,stop);
		}	
	}
	return null;
}	
function changeSrcParameter(param, str) {
	var urlParam = getParameter(param);
	if (urlParam != null && urlParam.length > 0) {
		var regStr = '(&|\\?)*(?:'+ param +'=[a-zA-Z0-9%_]+)';
		var regEx = new RegExp(regStr, "g");	
		if (str.match(regStr)) {
			return str.replace(regEx, '$1' + param + '=' + urlParam);
		} else {
			return str + '&' + param + '=' + urlParam;
		}
	} else {
		return str;
	}
}

function explodeScript() {
	var srcUri = '<'+'scr'+'ipt type="text/javascript" src="http://fotoforum.gazeta.pl/external.xjs?';
	var paramz = 'fftg=lays&amp;ffsc=1&amp;ffct=4&amp;ffcl=2';
	if (paramz.length > 0)
		paramz = paramz.replace(/%/g, '%25');
	
	paramz = changeSrcParameter('ffpe', paramz);
	paramz = changeSrcParameter('ffup', paramz);
	paramz = changeSrcParameter('fftg', paramz);
	
	srcUri += paramz;
	srcUri += '"></'+'scr'+'ipt>';
	document.write(srcUri);
}
explodeScript();