dd = new Date();
mm = dd.getMonth() + 1;

if (mm < 10) {
 mm = "0" + mm;
}

var today = mm;

season1 = 03;
end1 = 05;

season2 = 06;
end2 = 08;

season3 = 09;
end3 = 11;

if((today <= end1) && (today >= season1)){
swfobject.embedSWF("swf/spring.swf", "topswf", "950", "360", "9.0.0",'expressInstall.swf', {}, {wmode:"transparent"});

}else if((today <= end2) && (today >= season2)){
swfobject.embedSWF("swf/summer.swf", "topswf", "950", "360", "9.0.0",'expressInstall.swf', {}, {wmode:"transparent"});

}else if((today <= end3) && (today >= season3)){
swfobject.embedSWF("swf/autumn.swf", "topswf", "950", "360", "9.0.0",'expressInstall.swf', {}, {wmode:"transparent"});

}else{
swfobject.embedSWF("swf/winter.swf", "topswf", "950", "360", "9.0.0",'expressInstall.swf', {}, {wmode:"transparent"});
}