<p>Does anyone know how to resize images proportionally using JavaScript?</p>

<p>I have tried to modify the DOM by adding attributes <code>height</code> and <code>width</code> on the fly, but seems did not work on IE6.</p>

Instead of modifying the height and width attributes of the image, try modifying the CSS height and width.
```
```
myimg = document.getElementById('myimg');
myimg.style.height = "50px";
myimg.style.width = "50px";
```
```
One common "gotcha" is that the height and width styles are strings that include a unit, like "px" in the example above.
Edit - I think that setting the height and width directly instead of using style.height and style.width should work. It would also have the advantage of already having the original dimensions. Can you post a bit of your code? Are you sure you're in standards mode instead of quirks mode?
This should work:
```
```
myimg = document.getElementById('myimg');
myimg.height = myimg.height * 2;
myimg.width = myimg.width * 2;
```
```