Simple function question argument/parameter?

1 

function displaySelectedArray(whichArray, layoutMC, elementName, elementWidth, elementHeight)
{
	//layoutMC = layoutMC.toString();
	//elementName = elementName.toString();
	trace("name "+elementName)
	trace("layout "+layoutMC)
	trace("Width "+elementWidth)
	trace("Height "+elementHeight)
	for(i=0; i<whichArray.length;i++)
	{
	//dynamicly attach mc's to print_mc
	element = whichArray*;
	trace("Element "+element)
	_root.print_mc[layoutMC].attachMovie(element, elementName+i, i);
	_root.print_mc[layoutMC][elementName+i]._y = (elementHeight + 1)*i;
	_root.print_mc[layoutMC][elementName+i]._width = elementWidth;
	_root.print_mc[layoutMC][elementName+i]._height = elementHeight;
	}
	
}

but can’t get the name and layout to trace


	displaySelectedArray(userDesigns, design_mc, design,400, 80);

I would expect to trace
name design
layout design_mc

Any tips ?