CSS not working in Safari when I click on a link

Question

I have a webpage that works well with all browsers except Safari. When I first load my page in Safari, the frot page displays all the styling corresponding to that page. However, when I click on a link to go to another page the styling for the colors and images is not recognized. I wonder if somebody knows what can be causing this. Thanks in advance.

This class named "TableLeftNav" seems to disappear:

<div class="ui-layout-west container border TableLeftNav ui-layout-pane-west" style="position: absolute; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; right: auto; z-index: 0; left: 0px; width: 248px; top: 180px; bottom: 0px; height: 71px; display: block; visibility: visible;">

and the CSS for that class is:

.TableLeftNav { background-color: #003c79; width: 275px; border: #003c79; }