you can do an onclick to call a function to change the html in the div
using innerhtml
should just be able to change the link to the flash file
that is assuming you just need to change the html on the page to change the flash file
<script language="JavaScript">
function test(link1)
{
document.getElementById('test1').innerHTML=link1;
}
</script>
<div id=test1>
test
</div>
<input type="button" value="1" onclick=test("linkforswf1")>
<input type="button" value="2" onclick=test("linkforswf2")>
<input type="button" value="3" onclick=test("linkforswf3")>