Swimming in the CSS pool

{ /*1*/ position: absolute; float: left; width: 200px; z-index: 1000; display: none;
/*2*/ /* background: url(”) repeat-y; */

Above css entry (marked as /*2*/) causes the css to be loaded again when the page is being rendered. Browser redownloads the whole css file because of the url(”) expression. BEWARE forgeting such things in your css.