Named destinations - caching problem?

I have a pdf with many named destinations in it. I want to link to these different named destinations from an html page.
 
This is all fine as I use the format:
[link=http://mywebsite.com/xstrata/pdf/commentary.pdf#nameddestination1]http://mywebsite.com/xstrata/pdf/commentary.pdf#nameddestination1[/link]
in my html pages to link to different named destinations in the pdf.
 
However, after viewing a section of the pdf I've followed a link to from my html, when I use the back button to go back to my html page and click on a different link to go to a different part of the pdf, very often I'm taken to the previous point in the pdf, i.e.
 
if the previous destination I clicked to was
[link=http://mywebsite.com/xstrata/pdf/commentary.pdf#mining_overview]http://mywebsite.com/xstrata/pdf/commentary.pdf#mining_overview[/link]
 
this is where I'm taken rather than where I've actually clicked, eg
 
[link=http://mywebsite.com/xstrata/pdf/commentary.pdf#md_minerals]http://mywebsite.com/xstrata/pdf/commentary.pdf#md_minerals[/link]
 
This is presumably some form of caching. Is there any way around this?
 
Thanks
D