var default_menu_images = new Image();
var selected_menu_images = new Image();
var default_menu_url = new Array();
var selected_menu_url = new Array();

function selectMenu(n) {
	//alert("Menu image image URL = " + selected_menu_url[n-1]);
  	var btn = document.getElementById("menu"+n);
  	var drp = document.getElementById("dropDownMenu");
	btn.src = selected_menu_url[n-1];
	if (drp!= null){
		if (n==1) drp.style.visibility = 'visible';
		else drp.style.visibility = 'hidden';
	} /*else alert("drp== null"); */
}

function unSelectMenu(n) {
  	var btn = document.getElementById("menu"+n);
  	btn.src = default_menu_url[n-1];
  	var drp = document.getElementById("dropDownMenu");
  	if (drp!= null){
		drp.style.visibility = 'hidden';
	}
}