//f:getObj needed to set up for changing div states
function getObj(name){
  if (parent.nav.document.getElementById)
  {
  	this.obj = parent.nav.document.getElementById(name);
	this.style = parent.nav.document.getElementById(name).style;
  }
} 

//f: changes the nav sub-menu to display the correct sub-menu	
var menus = new Array('aboutus', 'services', 'booking', 'recruitment');

function setnav(clicked){
	for (i = 0; i < menus.length; i++){	
	//create getObj for each menu
		var oldState = new getObj(menus[i]);
	//hide all nav sub-menus
		oldState.style.visibility = "hidden";
		}
	
	var newState = new getObj(menus[clicked]);
	//set chosen nav sub-menu to visible
	newState.style.visibility = "visible";
}