<iframe src="main_folder.aspx" class="global_main" scrolling="auto" frameborder="0" name="main"></iframe>

/*自动宽度*/
global.autoWidth = function () {
//global_main
$(".global_main").height($(window).height() - $(".global_header").eq(0).outerHeight());
$('.global_main').width($(window).width() - $('.global_slide').eq(0).outerWidth()).show();
};