function changeNav(show,hide1,hide2){
	
	var elemid, hideid1, hideid2, vis;

	if(document.getElementById) {
		elemid = document.getElementById(show);
		hideid1 = document.getElementById(hide1);
		hideid2 = document.getElementById(hide2);
		//alert(elemid.className);
	}
	else if(document.all) {
		elemid = document.all[show];
		hideid1 = document.all[hide1];
		hideid2 = document.all[hide2];
		//alert("test");
	}
	else if(document.layers) {
		elemid = document.layers[show];
		hideid1 = document.layers[hide1];
		hideid2 = document.layers[hide2];
		//alert("test");
	}

	//alert(elemid.style.visibility);
	//return;
	
	if(elemid.style.visibility == '' || elemid.style.visibility == null) {
		elemid.style.visibility = 'visible';
		elemid.style.display = 'none';
		Effect.Appear(elemid, { duration: 0.5 });
		hideid1.style.visibility = 'hidden';
		hideid2.style.visibility = 'hidden';
		//vis.setProperty('display', 'block', 'important');					
		//elemname.src = '/images/minus.gif';
		//vis.display = (elem.offsetWidth != 0 && elem.offsetHeight != 0) ? 'block':'none';
	}
	/*
	else if (elemid.style.visibility == 'visible') {
		elemid.style.visibility = 'hidden';
		//vis.setProperty('display', 'none', 'important');
		//elemname.src = '/images/plus.gif';
	}
	*/
	else if (elemid.style.visibility == 'hidden') {
		elemid.style.visibility = 'visible';
		elemid.style.display = 'none';
		Effect.Appear(elemid, { duration: 0.5 });
		hideid1.style.visibility = 'hidden';
		hideid2.style.visibility = 'hidden';
		//vis.setProperty('display', 'block', 'important');
		//elemname.src = '/images/minus.gif';
	}
  
}