wget --user=admin --password='pass' http://www.mywebsite.com/test.php

--2012-05-02 10:14:01--  http://www.mywebsite.com/test.php
Resolving www.mywebsite.com... IP
Connecting to www.mywebsite.com|IP|:80... connected.
HTTP request sent, awaiting response... 401 Authorization Required
Reusing existing connection to www.mywebsite.com:80.
HTTP request sent, awaiting response... 403 Forbidden
2012-05-02 10:14:01 ERROR 403: Forbidden.

wget admin:pass@http://www.mywebsite.com/test.php

http://yoururl.ext?auth=id:psw

*/1 * * * *  wget -O /dev/null --user admin --password pass "http://www.mywebsite.com/test.php" > /dev/null 2>&1