server issues with form submit and jquery

i have two issues that i have problem with them and i dont really know where to start looking and how to handle them
i guess that they are related:

first one is jquery issue...

when i load the page on my computer (local) all appear right:

if($('.error',$formId).length) {
            return false;
        }
    else{ 
        $('#btn-submit').fadeOut(200, function() {
              $('#btn-submit').attr("src","images/Site_Images/checkMark.jpg");
              $('#btn-submit').fadeIn(200);
              $('#btn-submit').removeAttr('onmouseover').removeAttr('onmouseout');
        });

         // $formId.trigger('submit');
        }

the check mark image appear.

when i load my site in wamp server and remove the comments from--> // $formId.trigger('submit');

so the form will submit then the 2 issues occur :
( if i leave the submit line comment out then the image appear right )

it has to be something with the form submit.

first is the check mark that doesnt appear, instead a rectangle border appear .
and second is after submit. all the form disappear.

any help would be appreciate ..

Thanks in advanced.

Tags: jQuery, PHP