You can't use 'background' to pull in images inline. You would need to pull the background image in using your stylesheet.

Assign a class or id to the element you need to assign the background image to and then reference that id or class in your stylesheet using:

#id_name { background: url(images/main_images/tab_inside_search_bg.jpg) no-repeat left top; }

For ID

Or for class:

.class_name { background: url(images/main_images/tab_inside_search_bg.jpg) no-repeat left top; }

This is assuming the background image you are using is not meant to repeat.