function toggle( div_id, element_id ){
	var ul = document.getElementById( element_id ); 
	// loop through all elements in ul
	for( var i = 0; i < ul.childNodes.length; i++ ){
		var node = ul.childNodes[i];		// li
		for( var n = 0; n < node.childNodes.length; n++ ){ // loop through li's elements
			if( node.childNodes[n].nodeName == 'A' ){ // if we find a link
				var a = node.childNodes[n];
				if( a.className == div_id ){
					node.id = 'current';
					document.getElementById( a.className ).style.display = 'block';
				}
				else{
					node.id = '';
					document.getElementById( a.className ).style.display = 'none';
				}
			}
		}
	}
}

function refer_a_friend(){
	var recipient 	= document.getElementById('recipient');
	var sender 		= document.getElementById('sender');
	
	var opt = {
		method: 'post',
		postBody: 'refer_a_friend=1&recipient='+recipient+'&sender='+sender,
		onSuccess: function(t){
			var message = t.responseText;
			alert( message );
		}
	}
	new Ajax.Request(window.location, opt);
	
	recipient.value = 'YOUR EMAIL';
	sender.value 	='FRIENDS EMAIL';
}