you should use the ajaxSubmit function, the code to send a POST a request:
$("#imageform").ajaxSubmit({
url: 'ServerSidePage.php',
type: 'post',
success: function()
{
alert("works!");
}
});
EDIT: might check this out also:
$('#imageform').ajaxForm({
success: function(response, statusText) {
$('#preview').html(response);
}
});
i don't know what "#preview" is, might change it to "append" or whatever you need.