"
Add me to the growing list of people who are surprised and pleased to see the fantastic JavaScript debugging support in VS.NET (I discovered the details through Steve Sharrok's blog). To make it work, clear the 'disable script debugging' in IE, then drop the 'debugger;' statement in your script where you want to break:
 
function OnLookup()
{
debugger;
var xr = new XMLHttpRequest();
}
"
(Fritz Onion)