How to add Thesis Header

I'm trying to add my header for the Thesis template. What is wrong with this code?

/* This line sets up our clickable background image based on the site title’s link */
/* Adjust the height & width below to reflect the actual size of your image */
/* Change the filename of your image to reflect the actual header’s file name */.custom #header #logo a { display: block; height: 140px; width: 990px; background: url(’images/Logo.jpg’) no-repeat; outline: none; }

/* This line gets rid of the site title & tagline by casting them out to the far left */
.custom #header #logo, .custom #header #tagline { text-indent: -9999px; }

/* This line collapses the vertical space of the tagline so that there isn’t unnecessary white space after the header image */
.custom #header #tagline { height: 0; }

/* This line removes the padding from the header so that the background image sits close to the nav menu, the bottom border of the header, and the sides of the content */
.custom #header { padding: 0; }
/*

 

Looks like it is working?

 

How so? In Firefox it is not displaying, and in Chrome and IE8 there is a ton of white space over it.

Hey Alex

 

Refer to Sugarrae's tutorial on changing header

Hope it helps.