function checkEmail(field)
{
	if(field.value != '')
	{
		var url = 'FriendshipSystemAjaxRequests.php?email='+encodeURI(field.value); // 
		new Ajax.Request(url, 
			{
				method: 'get',
				onSuccess: handleFriendshipRequest,
				onFailure: function (t) { alert('ERROR: Ajax Request for the E-Mail Check.'); }
			}
		);
	}
	else
	{
		$('friendship_img_box_ok').hide();
		$('friendship_img_box_bad').hide();
	}
}

function handleFriendshipRequest(transport)
{
	try
	{
		var response = transport.responseText.evalJSON();
	}
	catch(e)
	{
		alert(transport.responseText.stripTags());
	}
	if(response == 'true')
	{
		$('friendship_img_box_ok').show();
		$('friendship_img_box_bad').hide();
	}
	else
	{
		$('friendship_img_box_ok').hide();
		$('friendship_img_box_bad').show();
	}
}