ShowDocument, valid URL

hi All,
I am very new to Java and would appreciate any help!
I have an applet running on our web server which our customers are using to search and look at files. Some files will have images (.pdf) that I would like for the customers to view in a new browser window.
I was able to show a .pdf file in a new browser by using the showDocument method, and hardcoding the url. url1= "http:/mywebserver.com/file123.pdf"
showDcoument(ur11)
My question is... what is the best way for me to validate and see if this pdf file exists ? so that I can show a button for the customer to view this document.
I am using the below method where xxx.pdf does not exist.. but it seems to always show the button even though xxx.pdf does not exist.
try {
url = new URL (http://mywebserver.com/xxx.pdf)
viewImageButton.setVisible(true);
catch (MalformedURLException e)
{viewImageButton.setVisible(false)}
Another thought I had was to use f.exists() to check if the file exists but that only works on local drives right ?
I would appeciate any help.
thank you !!

thanks for the suggestion marvin. the problem with that approach is that a database of all devices and their capabilities would need to be maintained and checked against. if we're just talking ipads, iphones and ipod touches, that's reasonable; but there's a huge and growing number of android devices out in the wild and they all have different capabilities...?
g

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