function adjustStyle(width) {
    width = parseInt(width);
    if (width < 800) {
        jQuery("#size-stylesheet").attr("href", "http://www.redesigned.pl/wp-content/themes/redesigned/css/narrow.css");
    } else if ((width >= 801) && (width < 900)) {
        jQuery("#size-stylesheet").attr("href", "http://www.redesigned.pl/wp-content/themes/redesigned/css/800.css");
    } else if ((width >= 901) && (width < 1080)) {
       jQuery("#size-stylesheet").attr("href", "http://www.redesigned.pl/wp-content/themes/redesigned/css/900.css"); 
    } else if ((width >= 1081) && (width < 1260)) {
       jQuery("#size-stylesheet").attr("href", "http://www.redesigned.pl/wp-content/themes/redesigned/css/1080.css"); 
    } else if ((width >= 1261) && (width < 1620)) {
       jQuery("#size-stylesheet").attr("href", "http://www.redesigned.pl/wp-content/themes/redesigned/css/1260.css"); 
    } else if ((width >= 1621) && (width < 1800)) {
       jQuery("#size-stylesheet").attr("href", "http://www.redesigned.pl/wp-content/themes/redesigned/css/1620.css"); 
    } else {
    	jQuery("#size-stylesheet").attr("href", "http://www.redesigned.pl/wp-content/themes/redesigned/css/1800.css");
    	}
}

jQuery(function() {
    adjustStyle(jQuery(this).width());
    jQuery(window).resize(function() {
        adjustStyle(jQuery(this).width());
    });
});