Though colorfully-worded, shenku is correct. Variable names can only begin with a letter, and underscore, or a dollar sign ($). To save yourself the trouble, you may just want to always prepend "GUID_" to the front of your variables, such as:
Code:
var GUID_bcfaeec0_3c34_4076_8abb_41d9b960c117 = 'as';
Nicholas C. Zakas
Author, Professional JavaScript for Web Developers (ISBN 0764579088)
http://www.nczonline.net/