function setIframeHeight() {
       var iframe = document.getElementById('sup_ctx_iframe');
       // 获取子页面的高度
       var height = window.frames["sup_ctx_iframe"].document.getElementsByTagName("body")[0].clientHeight;
        if(iframe)
        {
             if (undefined != iframe.ownerDocument
				&& undefined != iframe.ownerDocument.body.offsetHeight) {
                    iframe.height = height;
		}
	}
}

.content{
	height:auto !important;
	height: 500px;
	min-height: 500px;
}