stock String:FunctionGeneratePassword(value)
{
         decl String:generate[37] = "1234567890qwertyuiopasdfghjklzxcvbnm", String:password[value];
         for(new i = 0; i < value; i++) password[i] = generate[GetRandomInt(0, 35)];
         PrintToServer("FunctionGeneratePassword: %s", password);
}

#define FIRSTCHAR 0x3c
#define ENDCHAR 0x7a
public OnPluginStart()
{
            RegServerCmd("randpass", rndstr);
}
public Action:rndstr(args)
{
            new String:str[256];
            RandomPassword(str, 16);
            PrintToServer("Your password is: %s", str);
}
stock RandomPassword(String:out[], size)  //by horr0r
{     
            for(new i = 0; i < size; i++) out[i] = GetRandomInt(FIRSTCHAR, ENDCHAR);
            return 1;     
}