Due to the structure of my website, I am forced to use a iframe to display the dropdown menu html file. if not, I am not able to see the dropdown in IE. Here is the code I am using:

```html
<iframe id="a"name="FRAMENAME" src="http://website.com/dropdown.html" 
width="1000" style="position:relative" background="#F3F0ED" style="z-index:10000" 
height="40" frameborder="0" scrolling="no" allowautotransparency=true></iframe>

```

Now the problem is that the dropdown is hiding behind the other images on the website. I have specified `position:relative and z-index:10000` but I cannot get it to overlap on the images. The z-index of these images is much less than 10000. Any suggestions please?