function start() {
	var today = new Date();
	var month = today.getMonth() + 1;
	if (month > 10 || month < 4) document.getElementById('seasonal').style.backgroundImage = 'url(img/mainVinter_.jpg)';
}

var pageLoaded = 0;
window.onload = function() {pageLoaded = 1;}
	
function loaded(i,f) {
	if (document.getElementById && document.getElementById(i) != null) f();
	else if (!pageLoaded) setTimeout('loaded(\''+i+'\','+f+')',100);
}
loaded('seasonal',start);