if you're looking to just simply move an object along a plath its quite straight forward. Try this:

Code:

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#define MOVEMENT_SPEED skill1
var dist = 0; // entity path
var vLastPos[3];
var vDir[3];

action the_entity ()
{
	path_set(my, "the_path");
	while(1) 
	{
		path_spline(me,my.x,dist);
		dist += 5*time_step;
		vec_diff(vDir,my.x,vLastPos);
		vec_to_angle(my.pan,vDir);
		vec_set(vLastPos,my.x);
		ent_animate(my, "walk", my.MOVEMENT_SPEED, ANM_CYCLE);
		my.MOVEMENT_SPEED += 30 * time_step;
		wait(1);
	}
}  

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you can either assign this action to the entity in wed, or turn it into a function and assign it to an entity that you've created in your script. If you have a action already for the entity, then just put this in your current action.