$(document).ready(function() {
    var root = $("#root").attr("href");

    if(document.getElementById('portfolio')) {
    	$('ul#portfolio').innerfade({
    		speed: 1000,
    		timeout: 5000,
    		type: 'sequence',
    		containerheight: '250px'
    	});
    }

    var b = true;
    setInterval((function() {
        if(b) {
            $("#header").css('background-image', 'url('+root+'design/hlavicka2.jpg)');
            b = false;
        } else {
            $("#header").css('background-image', 'url('+root+'design/hlavicka1.jpg)');
            b = true;
        }
    }), 5000);

});