$(document).ready(function(){ var width = getWidth(); var height = getHeight(); var map_tags = $("#map_tags"); if(width > 1180) { var left = (width - 880)/2 -180; if(left < 0){ left = 0; } map_tags.css("width", "150px") .css("left", left + "px"); if(height >= 900){ map_tags.css("height", "750px") .css("top", "100px"); } else { map_tags.css("top", "150px"); } } else { map_tags.css({"width":"845px", "height": "80px", "position": "static", "margin-top": "10px"}); $("#map_tags li").css("float", "left"); } });