Обновлённый аналог массива GET.

<script>
 
/**
* Parses get params out of an url
*
* @param string url - an url . if empty or null - parses current page's url
* @return array GET - an array of params passed
*/
function parseGET(url)
{  
	if(!url || url == '') url = document.location.search;
	if(url.indexOf('?') < 0) return Array();
 
	url = url.split('?');
	url = url[1];
 
	var GET = [];
	var params = [];
	var keyval = [];
 
	if(url.indexOf('#')!=-1)    
	{    
		anchor = url.substr(url.indexOf('#')+1); 
		url = url.substr(0,url.indexOf('#'));
	}
 
	if(url.indexOf('&') > -1) params = url.split('&');
	else params[0] = url;
 
	for (i=0; i<params.length; i++)
	{
		if(params[i].indexOf('=') > -1) keyval = params[i].split('=');
		else { keyval[0] = params[i]; keyval[1] = true; }
		GET[keyval[0]]=keyval[1];
	}
 
	return (GET); 
};
 
 
var $_GET = parseGET();
alert($_GET['page']);
 
var $_GET = parseGET("http://host/index.php?id=7&page=2&lang=ch#TheEnd");
alert($_GET['page']);
</script>

Брал тут.