JQuery scroll to bottom
===

I am using this function to update a chat conversation. The function runs every 2 seconds.
When i scroll up, the update causes the page to scroll down again automaticly, which prevents me from reading old messages. How do i prevent this?

	function opdaterPost(til, fra){
	    $('.beskeder_vis').load('calls/opdater_post.php?til=' + til + '&fra=' + fra);
	    $("#beskeder_vis").animate({ scrollTop: $("#beskeder_vis").prop("scrollHeight") }, 1500);	
	}
