function button ( item, action ) {
	if ( document.images ) {
		var buttonimage = new Image ();
		if ( action == 'over' ) {
			buttonimage.src = 'images/nav/hover' + item + '.jpg';
		}
		
		else {
			buttonimage.src = 'images/nav/' + item + '.jpg';
			
		}
		
		navitem = document.getElementById ( item );
		navitem.src = buttonimage.src;
	}
}




function vistoggle ( item ) {
   if ( document.getElementById ( item ) ) {
      if ( document.getElementById ( item ).style.display == 'none' ) {
         document.getElementById ( item ).style.display = 'block';
      }

      else {
         document.getElementById ( item ).style.display = 'none';
      }
   }
}

function showdesc ( item ) {
   if ( document.getElementById ( item ) ) {
      var hide = 'false';
      if ( document.getElementById ( item ).style.display == 'block' ) {
         var hide = 'true';
      }

      for ( i = 0; descarray[i]; i++ ) {
         document.getElementById ( descarray[i] ).style.display = 'none';
      }

      if ( hide == 'false' ) {
         vistoggle ( item );
      }
   }
}

function hover ( item, action ) {
   if ( action == 'on' ) {
      var level = .5;
   }

   else {
      var level = 1;
   }

   document.getElementById ( item ).style.filter = "alpha(opacity:" + ( level * 100 ) + ")";
   document.getElementById ( item ).style.KHTMLOpacity = level;
   document.getElementById ( item ).style.MozOpacity = level;
   document.getElementById ( item ).style.opacity = level;
}