var dialog = $("#id").dialog({resizable:false,height:,width:,zIndex:,modal:true,open:function(event,ui){$(".ui-dialog-titlebar-close").hide();},buttons:{"确定":function(){//$(this).dialog("close");dialog.dialog("close");}}});
open:function(event,ui){$(".ui-dialog-titlebar-close").hide();}这段代码就可以控制dialog的右上角叉号去掉