function getParam(name)
{
	var from = getFrom();
	
	name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
	var regexS = "[\\?&]"+name+"=([^&#]*)";
	var regex = new RegExp( regexS );
	var results = regex.exec( from );
	
	if( results == null ) return ""; else return results[1];
}

function getUpDomain()
{
	var from = getFrom();
	var domain = from.match(/:\/\/(.[^/]+)/)[1];
	
	return domain;
}

function getFrom()
{
	var from;
	
	try
	{
		//Intentamos acceder al frame superior
		from = top.location.href;
	} catch(err)
	{
		//Si no podemos echamos mano de referrer
		from = document.referrer;
	}
	
	return from;
}