function showHide(whichDiv) {

	var prodGroup = document.getElementById(whichDiv);
	var currPlusMinusBtn = document.getElementById(whichDiv + 'PlusMinusBtn');
	var plusBtn = new Image;
	plusBtn.src = '../images/btn_minus_plus.gif';
	
	var minusBtn = new Image;
	minusBtn.src = '../images/btn_minus.gif';

	var state = prodGroup.style.display;
	if (state == 'none') {
		prodGroup.style.display = 'block';
		//currShowHideBtn.style.backgroundPosition = shiftedBtnPos;
		currPlusMinusBtn.src = minusBtn.src;
		
	} else if (state == 'block') {
		prodGroup.style.display = 'none';
		//currShowHideBtn.style.backgroundPosition = defaultBtnPos;
		currPlusMinusBtn.src = plusBtn.src;

	} else {
		prodGroup.style.display = 'block';
		//currShowHideBtn.style.backgroundPosition = shiftedBtnPos;
		currPlusMinusBtn.src = minusBtn.src;
	}

}