function PageQuery(q) {
	if(q.length > 1) this.q = q.substring(1, q.length);
	else this.q = null;
	this.keyValuePairs = new Array();
	if(q) 
		for(var i=0; i < this.q.split("&").length; i++) 
			this.keyValuePairs[i] = this.q.split("&")[i];
	
	
	this.getKeyValuePairs = function(){ 
		return this.keyValuePairs; 
	}
	
	this.getValue = function(s) {
		for(var j=0; j < this.keyValuePairs.length; j++) {
			if(this.keyValuePairs[j].split("=")[0] == s)
				return this.keyValuePairs[j].split("=")[1];
		}
		return false;
	}
	
	this.getParameters = function() {
		var a = new Array(this.getLength());
		for(var j=0; j < this.keyValuePairs.length; j++) 
			a[j] = this.keyValuePairs[j].split("=")[0];
		
		return a;
	}
	this.getLength = function() { 
		return this.keyValuePairs.length; 
	}
}

function queryString(key){
	var page = new PageQuery(window.location.search);
	var value=page.getValue(key[0]);
	//Domyslna wartosc
	value=(value)?value:key[1];
	return (value)?unescape(value):false;
}

function queryParams(keys){
	var page = new PageQuery(window.location.search);
	query='';
	for( i=0;i<keys.length;i++){
		param=queryString(keys[i]);
		if(param)
			query+= ((i>0)?'&':'')+(keys[i][0]+'='+escape(param));
	}
	return query;
}