in the script editor slashes are actually optional. Slashes I tend to use as it outlines commands, especially in long blocks of code, but are again trviial. The //'s are used only in the chat input to tell mirc to "Execute identifiers and avriables". i.e. goto a window and type:
/set %a 1
/echo -a %a
//echo -a %a
Notice the latter will execute for the value of a. This is handy for things like setting topics (//topic # blah instead of //topic #mychannelname blah), Etc.
If your script isn't working properly you have a problem with the script itself, not with if you prefixed with a /, // or nothing at all.
