$(document).ready(function() {
$("div.panel_button").click(function(){
    if ( $.browser.msie ){
	$('#headFlash,.swf,#roundarriba').css('visibility','hidden') ;
    }
    $("div#panel").animate({
    height: "500px"
    });

    $("div#panel").animate({
    height: "400px"
    }, "fast");
    $("div.panel_button").toggle();

 });
    $("div#hide_button").click(function(){
	$("div#panel").animate(
	    {
	    height: "0px"
	    },
	    "fast",
	    function(){if ( $.browser.msie ) $('#headFlash,.swf,#roundarriba').css('visibility','visible') ;}
	);
    });
});