<form enctype="multipart/form-data" method="post" action="" class="f-task">
 <input type="hidden" value="<?echo bitrix_sessid();?>" name="sid" class="sid">
 <input class="form-control" id="in1" name="in1" type="text" placeholder="<?=GetMessage("#modul_upper_full#_ZNACHENIE_POLYA1");?>" value="<?=GetMessage("#modul_upper_full#_ZNACHENIE_POLYA1");?>" />
 <button type="button" class="btn btn-primary btn-primary_ok" onclick="send_ajax(this);"><?=GetMessage("#modul_upper_full#_OTPRAVIT_AJAX_ZAPROS");?></button>
</form>