Passing a parameter to a Div element

I've been writing my own music database using a web front end, I found a free to use player called Wimpy, can create my own favourite tracks and save them to an XML file, the player picks up these tracks and plays them.

 

2 issues exist the first. The player will not sit correctly within UpdatePanels, I have to keep refreshing the page for it to stay on therefore I have had to keep it outside from the rest of the HTML code, not practical but it works

 

The second issue I have is, I have an ASP Dropdown with the favourites listed which are held / retrieved from a SQL Server database, I want to press a button which updates part of the following code

 

I somehow need it to update the part contained within the quotes with the Dropdown DataText field, data-media="SimpleMinds.xml", with data-media="Ultravox.xml", is there a way to update this part using C# or is there a better easier way. I was thinking of saving the parts in quotes as a parameter and somehow passing it in

 

Many thanks for your help