openarch=function(){
	document.getElementById('nav1').style.opacity = 0;
	document.getElementById('nav1').style.filter = 'alpha(opacity=0)';
	document.getElementById('nav1').style.display="block";
	for (var i=0;i<11;i++)
		setTimeout('setOpacity('+i+')',100*i);
}

function setOpacity(value)
{
	testObj=document.getElementById('nav1');
	testObj.style.opacity = value/10;
	testObj.style.filter = 'alpha(opacity=' + value*10 + ')';
}