pixelInset to Move a GUITexture C#

I need to move a GUITexture using pixelInset, easy. The hard part is that I need the GUITexture to move on the Y axis -46 down smoothly, in amount 1 to 2 seconds. When finished I need it to go back to its original spot of -274. There's other code handling the fading so by them time it goes back to -274 it will be 100% transparent.

Written in C#.

So I have:

 medalSpeedCalculator = -274;
 medalSpeedTime -= -.5f;        
 medalSpeed = medalSpeedCalculator - medalSpeedTime;
 
 MultiplierMedal.pixelInset = new Rect(266, medalSpeed, 75, 75);

 if (medalSpeed >= -310)
             {
                 medalSpeed = 0;
             }

The problem is that the medalSpeed value will always be the pixelInset Y value. So I need a way to go from point A to point B then restart. The medalSpeed seems to always keep its climbing value and exceeds -310. This process is repeated so the value needs to be reset each time. This is all in an if statement.

This sounds like it could be done using a lerp, but I'm not sure how I would do it. I'm new to C# as I only program with js and I'm not familiar with pixelInset or GUITexture coding wise.

There's no easy way to explain this and I hope I gave enough info. If anyone needs more info just let me know.

Thanks in advance!