Load css by date with javascript

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I'm looking to load different css files according to the date (season).I tried modifying an image script from here on stackoverflow, but that didn't work.Can anybody point me out where it goes wrong?\[code\]<link href="http://stackoverflow.com/css_season/default.css" rel="stylesheet" type="text/css" onload="logo(this)">\[/code\]\[code\]function logo(link) { var d = new Date(); var Today = d.getDate(); var Month = d.getMonth(); var src; if (Month === 4 && (Today >= 1 && Today <= 30)) { src = "http://stackoverflow.com/css_season/easter.css"; } else if (Month === 7 && (Today >= 1 && Today <= 31)) { src = "http://stackoverflow.com/css_season/vacation.css"; } else if ((Month === 8 && Today >= 30) || (Month === 0 && Today <= 2)) { src = "http://stackoverflow.com/css_season/vacation.css"; } else if (Month === 12 && (Today >= 15 && Today <= 31)) { src = "http://stackoverflow.com/css_season/holidays.css"; } link.href=http://stackoverflow.com/questions/14067564/href;}\[/code\]