将变量从服务器上的外部文件加载到HTML doc？

The title really says it all, but I'd like to have a file with many strings in a folder with my .html file, and somehow load them into the page, perhaps with document.write() or something like that. The website follows one template, and I need to have many string files to interchangeably load into the document, as I imagine a social network does with it's profile page. For example:The title really says it all, but I'd like to h