如何在文本输入的（顶部）内放置一个跨浏览器按钮？

I'd like to create a text input with a clear button in a confined space. Like the iPhone, I want to place the button (a small x image) 'inside' the input at the far right so that a user can just click that to clear the value, instead of having to waste space beside the input.I'd like to create a text input with a clear bu