When creating websites for Safari Mobile (iPhone, iPod touch etc) you will probably notice that fixed css positioning does not work as it is supposed to:

position: fixed;

Quite irritating, but it has to do with the way iPhone renders the website, when you scroll on a website, you are actually just panning around on a big static webpage.

If you want to create a fixed element, be it an image, div, text or whatever, on your website, you can use this javascript code as a workaround:

window.onscroll = function() 
	document.getElementById('elementID').style.top = (window.pageYOffset + 		window.innerHeight - elementHeight) + 'px';