function CalcPopup (win_action) {
	var page_background = document.getElementById('page-dark-wrapper');
	var product_calc = document.getElementById('productcalc');

	var height;
	var winHeight = (typeof window.innerHeight != 'undefined' ? window.innerHeight : document.body.offsetHeight);
	var scrollHeight = window.document.body.scrollHeight;
	var winWidth = window.document.body.scrollWidth;
	if (winHeight > scrollHeight){
		height = winHeight;
	} else{
		height = scrollHeight;
	}

	if (win_action == 'show') {
		page_background.style.height = height + 'px';
		page_background.style.width = winWidth + 'px';
		product_calc.style.width = winWidth + 'px';

		page_background.style.display = 'block';
		product_calc.style.display = 'block';
	} else if (win_action == 'hide') {
		page_background.style.display = 'none';
		product_calc.style.display = 'none';
	}

	return false;
}