Easy question -- at least i hope so

loadVariablesNum ("…/load.php", 0);
if (fid == “”) {
set ("_global.fid", “100”);

Hey everyone i just want to make sure i writing this correctly i have a script in load.php that will define the variable fid but if there is no variable defined in the script I want the variable fid to = 100. Am i missing something cause its not working.