Well in the user control panel is a link to your ftp site for the server. In the ftp site you'll find the "cstrike", open that. Then you'll see the "maps" folder, open that. That's where the map file goes. Same goes for materials, sounds, and the others. When you download a map you put the file in the same folder path that the download shows. All you have to do is drag and drop or copy and paste. You may need a FTP program, like SmartFTP, which allows for easier ftp support.
Downloaded file you want to upload path:
C:\Documents and Settings\Administrator\Desktop\cstrike\maps\de_dus t2
Place the file in this path on your HOME server:
C:\Program Files (x86)\Steam\steamapps\LOGIN\source dedicated server\cstrike\maps\...
Place the file in this path on your company hosted server:
FTP site\cstrike\maps\...
i tihnk that is how you do it.
and also hakop...your caps key seems to be stuck :S please fix it hard on the eyes