 Usage:  i = selectitem(headline, items {, mode})     
 
 Input:

  headline               a string 
                         
                         
                         
                         
  items                  a vector of strings 
                         
                         
                         
                         
                         
                         
  mode                   a string (only one option is "single") 
                         
                         
                         
                         
 Output:

  i                      a number of selected item, 1 ... rows of items 
                         
                         
                         
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
