Connection type? Is it a common usage? In ie-proprietary agent, you have clientcaps behavior which exposes a connectionType. If that's not what you need, cannot help.
[tt]
<html>
<head>
<script language="javascript">
function doit() {
var oelem=document.getElementById("x");
oelem.style.behavior="url(#default#clientCaps)";
oelem.innerHTML+=oelem.connectionType;
}
window.onload=doit;
</script>
</head>
<body>
<span id="x">ConnectionType: </span>
</body>
</html>
[/tt]