Networking issues with MacBook Pro

I have tried to find this issue on line and in the forums and couldn't   I have seen many people have similar issues using VPN connections or Citrix but nothing what I am seeing.  I have 3 MacBook Pros that connect fine to our company network.  They have the DNS settings from our DHCP server and I can see their leases and everything.  We can connect to network drives however we can't connect any of them to the company's intranet sites.  If we type in http://companysite  and hit enter both Safari and Firefox come back stating that they can't find the server companysite.  Not sure why it is looking for a server by the name of companysite when our DNS servers point to the servers that are hosting the sites. 
If I type in the IP address of any company site then it works however using the name doesn't.  So it sounds like an issue with DNS but again the DNS servers are in the network settings and Windows machines have no issues with using the http://companysite instead of using http://IP Address.  Any assistance would be appreciated.

OK, figured out that if I added my company's domain to the search domain list in Network Settings this would allow the MacBook to use http://companysite instead of the IP Address.  However now I need to figure out the authentication issue.  We use the end user's network credentials for access to the company intranet sites.  Using http://companysite I get access denied.  Using the IP address allows the end user to enter in their network credentials.

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