String/image Functions In Macros

[user_deleted]

I'm trying to make a Fetch Macro to help getting the NodeView more Organized.
pasting the code below should explain what im trying to do.
Is there a way to read out my string and return the actual image Variable ?

CODE
Checker1 = Checker(720, 486, 1, 32, xSize/GetDefaultAspect());
ColorWheel1 = ColorWheel(720, 486, 1, 0, 1, 1, 1);
Blur1 = Blur(ColorWheel1, 20, xPixels/GetDefaultAspect(), 0,
    "gauss", xFilter, "rgba");
Over1 = Over(Blur1, Checker1, 1, 0, 0);
image fetch(string RefNode)
{return Over1.Out;}
fetch1 = fetch("Over1");