function ajaxpage(url, containerid){
	var page_request = false
	if (window.XMLHttpRequest) // if Mozilla, Safari etc
		page_request = new XMLHttpRequest()
	else if (window.ActiveXObject){ // if IE
		try {
			page_request = new ActiveXObject("Msxml2.XMLHTTP")
		}catch (e){
			try{
				page_request = new ActiveXObject("Microsoft.XMLHTTP")
			}catch (e){}
		}
	} else return false


	page_request.onreadystatechange=function(){
		loadpage(page_request, containerid)
	}

	page_request.open('GET', url, true)
	page_request.send(null)
}

function loadpage(page_request, containerid){
	if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1))
		document.getElementById(containerid).innerHTML=page_request.responseText
}

window.onload =	function()
					{
						ajaxpage('file1.txt', 'alerta');
					}



function showSubMenu(id) {
	document.getElementById(id).style.display = "block";
}
function hideSubMenu(id) {
	document.getElementById(id).style.display = "none";
}