insert data in database mysql with jquery and php

insert data in database mysql with jquery and php

Hi To all,
I'm triyng to use the $.ajax jquery function to insert some dates in a database, using php.

I have the page that insert the data called : sign.php

and in the page I have the form, and the ajax scritp.

$("#submit_sign").click(function(data){
$.ajax({
type: "POST",
url: ("sign.php"),
cache : "false",
success: function(data){
$("#response").fadeIn("slow");
$("#response").html(data);
}
});
return false;

});


if I use the page without ajax it works, if I use the script jquery it works but doesn't insert the dates in the field, it send only white field.
So the problem is that I can't pass the variable POST beetween the ajax script and the php script.
Can you help me to find a solution pls?
I'm a newbie about ajax.
Thanks in advantage