Wall Running with triggers, how to do it?

I'm making a free running/parkour game like mirror's edge and one of the best ways I can think of is making 3 triggers on the player, one on left, one on right, and one on front of the character, my character is a rigidbody btw, I want to add probably one script for each trigger, to call something like this:

 function OnTriggerEnter (col : Collider)
 {
     if ( col.gameObject.tag == "wall")
     sendMessage ("WallRunRight")
 }

but how do I send a function like this to my main script? and then On my main script I would have like a function o tell what that function does? Or you think it's better this way?

 var MainPlayer : gameobject;
 var WallRunningRight : boolean = false;
 
     function OnTriggerEnter (col : Collider)
     {
         if ( col.gameObject.tag == "wall")
         WallRunningRight = true
     }

and then on function update I would use something like this;

 function update ()
 {
     if (WallRunningRight)
     MainPlayer.rigidbody.useGravity = false; // then I'll add some force to decal down over time, but tell me wich way you think it's better or even if none of these would do a good work
 }

edit: ok it is kinda working I tried the second one but it's giving me some problems, Idk Why but when I jump during left wallrun it goes more far than if I jump while right wallrun, and when I'm in right wall run and pressing "D" to go against wall it jumps to the left as it should, but if I'm on a left wall run and press A against the wall and then jump I jump to the wall instead and that will let me jump multiple time since I don't go away from the wall. Take a look at my scripts please: http://pastebin.com/hFZ20fmH, it's the main script, right wall run script : http://pastebin.com/njk53BXZ and left wallrun script: http://pastebin.com/QntPxR8A