function set_reservation_child(strURL, id) {
	
	if (window.XMLHttpRequest) {
		
		xmlhttp = new XMLHttpRequest();
  	
	} else {
		
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  	
	}
	
	xmlhttp.onreadystatechange = function() {
 
 		if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
			
			// check radiobutton

			elm = document.getElementById('child-r'+id);
			elm.checked = true;

			// submit form

			elm_check = document.getElementById('select_child');
			elm_check.value = 1;

			document.reservation_form.submit();
    	
		}
  	}

	xmlhttp.open("GET", strURL, true);
	xmlhttp.send();

}