function trim(cadena)
{
	for(i=0; i<cadena.length; )
	{
		if(cadena.charAt(i)==" ")
		cadena = cadena.substring(i+1, cadena.length);
		else
		break;
	}
	for(i = cadena.length-1; i>=0; i = cadena.length-1)
	{
		if(cadena.charAt(i)==" ")
		cadena = cadena.substring(0,i);
		else
		break;
	}
	return cadena;
}

function getCookie(name){
	var cname = name + "=";
	var dc = document.cookie;
	if (dc.length > 0) {
		begin = dc.indexOf(cname);
		if (begin != -1) {
			begin += cname.length;
			end = dc.indexOf(";", begin);
			if (end == -1) end = dc.length;
			return unescape(dc.substring(begin, end));
		}
	}
	return null;
}

function setCookie(name, value, expires, path, domain, secure) {
	document.cookie = name + "=" + escape(value) +
	((expires == null) ? "" : "; expires=" + expires.toString()) +
	((path == null) ? "" : "; path=" + path) +
	((domain == null) ? "" : "; domain=" + domain) +
	((secure == null) ? "" : "; secure");
}

function delCookie(name,path,domain) {
	if (getCookie(name)) {
		document.cookie = name + "=" +
		((path == null) ? "" : "; path=" + path) +
		((domain == null) ? "" : "; domain=" + domain) +
		"; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}