For the first:
<iframe src="whatever.htm" width="300" height="250" scrolling="no"></iframe>
For the second, I'm not sure what you mean. An image may always be reloaded in one of two ways:
- From the browser's cache.
- From the server.
You can prevent the browser from caching the image. But the only ways of preventing the image from being reloaded from the server are to either remove it from the server or to remove the code that points to it on the server from your page. In either of these cases, that will make the image disappear.
What exactly are you trying to do with the image, and why?