[jQuery] document.getSelection() and FireFox 2.0.0.11

[saidbakr]

Hi,
The following code doesn't work with FireFox. It works fine with MSIE
7. This message was generated from error consol:
Deprecated method document.getSelection() called.  Please use
window.getSelection() instead.

The code :

function chkAva(lnk,id){
el = document.getElementById(id).value;
if (el == ''){
alert('The user id should have a value before check');
return;
}
av = "Available";
na =  "Not Available, choose another one!"

$(document).ready(function(){
$("#"+lnk).before("<img src='imgs/wait.gif' id='waitImg' /> ");
$.ajax({url: 'chk_user.php',type:'GET', data: 'Id='+ el, cache: false,
dataType: "script", success: function(data, textStatus){

    $("#waitImg").remove()
        if (data == 0){
                if (document.getElementById('av') == null){
                $("#"+lnk).after(" <span id='av' class='hint'> "+av+"</span>");
                }
                else{
                        $("#av").empty();
                        $("#"+lnk).after(" <span id='av' class='hint'> 
"+av+"</span>");
                }
        }
        else{
                if (document.getElementById('av') != null){
                        $("#av").empty();
                }
                $("#"+lnk).after(" <span id='av' class='hint'> "+na+"</span>");
                }

        },
        error: function(x,txt,err){
        $("#waitImg").remove();
        alert('Could not check...'+"\n"+'The server may down or busy. Retry
again after a while.');
        }
});
});