在MouseOver上处理ASP.NET Ajax模式的最佳方法 - 仅在请求时提取数据

I'm looking to create a modal popup that only pulls the data inside the modal popup at the point of mouseover, so i dont have to preload a ton of data - instead i would like it to pull the data at the point of mouseover - are there any existing scripts/frameworks out there that would make this easy?I'm looking to create a modal popup that only p