$(document).ready(function(){
	
	$('#tri_gamme').change(function(){
		
		var currentLocation =  document.location.href;
		var query = "?";
		
		// Parse the current page's querystring
		var qs = new Querystring()
		if (qs.contains("id"))
		{ 
			query += "id=" + qs.get("id");

		}
		
		if(query.length > 1)
		{
			query += "&";
		}
		query += "tri=" + $('#tri_gamme').val();

		window.location.href = query;
	});
	
});