redirect based off server string

Anyone have a script or know of a way to check and see what the url is of a system and then sending it to another url if it is not right? I have this problem where if someone is using: http://www.ces.ncsu.edu/depts/fourh instead of: http://www.nc4h.org to get to my site it is breaking other pieces within it (though there is code in place which supposedly stops this from happening, I have found that this is not the case) what I plan on doing is invoking the script on the main page of each man sub-directory and the main page so that it should catch the majority of folks. Any suggestions/help would be greatly appreciated! Robert -- Robert Sossomon, Business and Technology Application Technician 4-H Youth Development Department 512 BrickHaven Drive Suite 220L, Campus Box 7606 N.C. State University Raleigh NC 27695-7606 Phone: 919/515-8474 Fax: 919/515-7812 robert_sossomon@ncsu.edu