It helps a lot if you have shell access to the machine where the script resides. If you do then:

To see if you have extra line end characters:
 vi <script name>
you'll see a ^M at the end of each line. To quit vi:
 <esc>:q!

To fix this (on many unix flavors):
 dos2unix <script name> <script name>

Uploading the file in "text" mode in some ftp clients will automatically convert the line enders for you when performing an upload/download. Note that some ftp clients DON'T do this, YMMV. Binary mode is /Absolutely Necessary/ if you uploading gifs, jpgs, etc. Some ftp clients have an "automatic mode" which will use what it thinks is the right mode depending on the file extension. Again, YMMV. Cheers

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Nothing is too wonderful to be true
-- Michael Faraday