function mostrar_promo(){
		document.getElementById('publicidad').style.display='block';
		setTimeout("cerrar_publicidad()",30000);
	}

	function cerrar_publicidad (){
		document.getElementById('publicidad').style.display='none';
	}
	


var expDays = 10;
var frecuencia=1;


function GetCookie (name)
{ 
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen)
	{   
		var j = i + alen;
		if (document.cookie.substring(i, j) == arg)
		return getCookieVal (j);
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) break;
	} 
	return null;
}

function SetCookie (name, value)
{ 
	var argv = SetCookie.arguments;
	var argc = SetCookie.arguments.length;
	var expires = (argc > 2) ? argv[2] : null;
	var path = (argc > 3) ? argv[3] : null;
	var domain = (argc > 4) ? argv[4] : null;
	var secure = (argc > 5) ? argv[5] : false;
	document.cookie = name + "=" + escape (value) +
	((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
	((path == null) ? "" : ("; path=" + path)) + 
	((domain == null) ? "" : ("; domain=" + domain)) +
	((secure == true) ? "; secure" : "")
}

function DeleteCookie (name)
{ 
	var exp = new Date();
	exp.setTime (exp.getTime() - 1);
	var cval = GetCookie (name);
	document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

var exp = new Date();
exp.setTime(exp.getTime() + (expDays*24*60*60*1000));

function amt()
{
	var count = GetCookie('count')
	if(count == null)
	{
		SetCookie('count','1')
		return 1
	}
	else
	{
		var newcount = parseInt(count) + 1;
		DeleteCookie('count')
		SetCookie('count',newcount,exp)
		return count
	}
}

function getCookieVal(offset)
{
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1)
	endstr = document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr));
}

function mostrar_publicidad()
{
	var count = GetCookie('count');
    if (count < 10000)
    {
		if (count % frecuencia== 0)
        {
			count++;
            SetCookie('count', count, exp);
            mostrar_promo();
        }
        else
        {
            count++;
            SetCookie('count', count, exp);
        }
	}
}