/* get child return new image */
function transform(obj,img,num){
	var elm = obj.firstChild;
	elm.src = img;
}
function rollover(obj,img){
	transform(obj,img);
}
function rollout(obj,img){
	transform(obj,img);
}	
function clickswap(obj,img){
	transform(obj,img);		
}
var curnum = 0;
/* swap menus and fire rollover */
function menuswap(num, obj, img){
	/* swap sub nav */
	var elm = document.getElementById("hnavbot"+curnum);
	elm.style.display = "none";
	var elm2 = document.getElementById("hnavbot"+num);
	elm2.style.display = "block";
	curnum = num;
	/* swap img */
	if(img) rollover(obj,img);
}