Mountain Biking - adjustable jump?

looking to build a jump and I thought it would be really great to make it adjustable for a number of reasons. I plan to use plywood to make it. Any ideas for making this adjustable?

Straight or curved? Personally, for a combination of simplicity, safety and durability, I would use a sliding wedge-block design for straight ramps. If you intend to do curved or non-linear ramps then you could break it up into three or four sections straight sections each with their own adjustable wedges.

I am thinking straight....im not too advanced. im not quite sure I understand what your saying either. Do you have any links?

Setup the ramp with two bars alone the side. Drill big holes (2 inch maybe) into the beams. Now setup two beams upright the width apart of the jump. Be sure to do it like a triangle (with two other 2x4's angulated to the ground from the support beams). Drill matching holes in those say 6inches apart. Now get a 2inch pipe and raise and lower the jump as desired.

Setup the ramp with two bars alone the side. Drill big holes (2 inch maybe) into the beams. Now setup two beams upright the width apart of the jump. Be sure to do it like a triangle (with two other 2x4's angulated to the ground from the support beams). Drill matching holes in those say 6inches apart. Now get a 2inch pipe and raise and lower the jump as desired.

Check this out. My explanation blows but this should give you an idea of what I mean. Check out the landing for what I mean exactly.

sweet, I guess now I have a plan

thank you very much