Highlight comment in gauss mode

[address@hidden]

Hi, 

I would like to ask if anyone can help me setup highlight gauss mode
comment such as the two different types:

@ This is one line comment @

/* 
This is multiple-lines comments
*/

My current syntax  table is as the follows but it did not work.

  (modify-syntax-entry ?@ "\"" gauss-mode-syntax-table)
  (modify-syntax-entry ?/ ". 14b" gauss-mode-syntax-table)
  (modify-syntax-entry ?* ". 23b" gauss-mode-syntax-table)

Please help me correct my error. Any help is appreciated.

James