Protocol is a property of both the Link and the Location objects and is the string at the beginning of a URL, up to and including the first colon (:), which specifies the method of access to the URL. Assuming a link (stored in the first element of the Links property) to a URL ...

http://home.newco.com/products/enquiries.htm#local?email=name@otherco.com

...the following code would display the protocol property of it:

Code:
document.write(document.links[0].protocol)

Output:
http:

NOTE:

Although the protocol property can be set at any time, it is safer to set the href property to change a link