$(document).ready(function(){  

	$("#group_id").attr("disabled","disabled");
	$("#office_id").attr("disabled","disabled");
	$("#group_type_select").css("visibility","hidden");
	$("#password").attr("disabled","disabled");	

    // вешаем на change по элементу с id = #city
    $("#city_id").change(function(){  	    			
   		$("#office").load('/mod/main/inc/office_export.php?city_id='+this.value);
   		$("#group_id").attr("disabled","disabled");	
   		$("#group_type_select").css("visibility","hidden");		
	});
});