I have an HTML img tag with a static HTML link.
My idea is to dynamically change that link (but not the image) based on what type of device my user is connecting from. The major types of devices I am concerned with are PC, Google/Andriod, Ios, Amazon/Andriod.
Is there an HTML/CSS/Javascript solution to this, or is php/dom/server side the only options?
Javascript/JQuery will work for you. Let's say you used the code from here to detect different mobile browsers: http://www.abeautifulsite.net/blog/2011/11/detecting-mobile-devices-with-javascript/
Then you could write something like this:
if( isMobile.iOS() || isMobile.Android() ){
$('a#mylink').attr('href', 'http://newlink.com');
}