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

function changeLanguage(lang) {
	if (lang == 'pt') {
		window.location.href="pagina.php?" + get_all_params();
	}else{
		window.location.href="page.php?" + get_all_params();
	}
}