FancyBox $.post success callback failed?

I have a fancy box with the follow code:

$("a#inline").fancybox({
    'titleShow'     : false,
    'width'         : 500,
    'height'        : 500
    });

And a $.post calling when submit button in fancybox clicked.

$("#submitbtn").live('click',function(){
    var timesch = $("#timesch").val();
    var actsch = $("#actsch").val();
    var postdata ="timesch=" + timesch + "&actsch=" + actsch;

    //$.fancybox.showActivity();
    $.post("insertsch.php",postdata,function(data){
            alert(data);
    });

});

The matter is the alert(data); doesn't pop back what it suppose to in the succe开发者_高级运维ss call. I've tested the content in php insertsch.php it work normally but not when it passing back to the success....

in insertsch.php code:

<?php
    //bla bla insert into database then echo this success
    echo "success";
?>

**Note alert(data) is simply just to post back echo "success" in the insertsch.php to test the callback working or not and it doesn't somehow.

Found the problem cause I didn't return false after ajax posting...

Your post data needs to be in an object literal. Try this:

var postdata = {timesch : timesch, actsch : actsch};