Problem with a menu being displayed across the top.

You've got a bad redirect active, which adds "www." before the "http://", so we can't see your site.

You have a style in your CSS (see below) that has a height of 8px - this is what is causing the problem. Either remove the :before style completely or change the height to 0 (or display; none). I would remove the style - if you are setting the height to 0 (or display; none) you are not using the style anyway so might as well remove it.

#cssmenu:before {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAICAIAAAC3eAIWAAAAA3NCSVQICAjb4U/gAAAAI0lEQVQImWPwj0hh+v//PxPD//9M////Z/rP8J/p//9/MD4AGUETB+SFfCsAAAAASUVORK5CYII=);
  background-color: #606a77;
  background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #4f5864), color-stop(1, #49515b));
  background-image: -webkit-linear-gradient(top, #4f5864, #49515b);
  background-image: -moz-linear-gradient(top, #4f5864, #49515b);
  background-image: -o-linear-gradient(top, #4f5864, #49515b);
  background-image: linear-gradient(#4f5864, #49515b);
  -moz-box-shadow: inset 0 2px 0 #586270, inset 0 1px 0 #6b7888;
  -webkit-box-shadow: inset 0 2px 0 #586270, inset 0 1px 0 #6b7888;
  box-shadow: inset 0 2px 0 #586270, inset 0 1px 0 #6b7888;
  content: '';
  display: block;
  height: 8px;  /* <==== THIS IS WHERE THE LINE COMES FROM */
}

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Alternatively you could add a new style to override the display (say .nolinebefore) and then add the .nolinebefore class to your cssmenu element.

#cssmenu.nolinebefore:before {
  display: none;
}

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Got it.
The second question is, the question is how to change the color on the main menu when a sub is selected.
I am attaching the code for the menu and two screen prints.
menu_inc.php

Forgot to add the screen print
JoeScreen.doc