i don't know if i understood your code correctly, but if i did i think that's the problem:

Code:

---

function load_level
{
if blah blah blah
{
  level_load ("levelname.wmb");//you forgot the ""
  /*The tutorial i used said to place any actions for the next level after that level's loading function...*/
other stuff
}
/*...which would be HERE, outside the load_level function*/
action level_change
{
//my.event = impact; //'my.event' is actually the function
                     // that handles the event
//my.function = Load_level;//as far as i know, 'my.function' only works for particles...
my.enable_impact = on;
my.event = load_level;
}

---