function update(){
$("#submit_button").attr("disabled","disabled");
$("#submit_button").val('update...');
Dyhb.AjaxSubmit('informationUpd','','',function(data,status){
$("#submit_button").attr("disabled",false);
$("#submit_button").val("更新");
});
}
function usersignPreview(){
sHtml=windsforceAjaxhtml(_ROOT_+'/index.php?app=home&c=spaceadmin&a=usersign&content='+$('#user_sign').val());
$('#usersign_preview').html(sHtml);
}