Many documents appear in several places on the Internet. Only cite those you have actually accessed, including the date of your last access. If there is a choice then choose the one likely to be the most stable and long-lasting. Electronic sources rarely have a consistent formatting or page numbering scheme. Try to be as specific as possible if quoting from a lengthy resource.
Many Web documents do give an author.
If this is not explicit you may find the information in the header of the HTML encoded text. You can view this by choosing the option to View Page Source in Netscape and View Source in Internet Explorer. The title of a web page will normally be the main heading on the page, or in the blue strip at the top of the screen. Always cite the date you last accessed a source being cited. This is essential if a document is likely to be revised or to move or indeed to disappear from a site.