Wrong page name being highlighted in Navigation Menu

When viewing my website, except for the Index page (entitled "SanDiegoTicketExpert" which properly remains highlighted in red with all other page names in white on the Navigation Menu), when I then click on any other page, although the page name properly displays the red mouseover highlight prior to clicking the link, after clicking and being transferred to that page, the Navigation Menu red highlights the name of a different page, while the name of the page being viewed remains white. For example, when I click on 'Contact Us' I am properly taken to that page, but the Navigation Menu red highlights the 'About Us' page while the "Contact Us' page I am viewing remains un-highlighted in white. If I am on the 'About Us' page, 'Website Links' is instead red highlighted, etc.

Obviously, really frustrating, any help would be much appreciated, Thanks.