function showkbrewesCustomizerLightbox(products_id) {

	var arrayPageSize = getPageSize();
	
	$('kbrewescustomizer-overlay-'+products_id).setStyle({ width:arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });
	$('kbrewescustomizer-overlay-'+products_id).observe('click', function() {
		new Effect.Fade('kbrewescustomizer-overlay-'+products_id, { duration: 0.2 });
		$('kbrewescustomizer-lightbox-'+products_id).hide();
	});

	$('kbrewescustomizer-overlay-'+products_id).show();
	$('kbrewescustomizer-lightbox-'+products_id).show();

	new Effect.Appear('kbrewescustomizer-overlay-'+products_id, {duration:0.2, from:0.0, to:0.8});

	$('kbrewescustomizer-lightbox-'+products_id).setStyle({width:970+'px'});

	// calculate top and left offset for the lightbox 
        var arrayPageScroll = document.viewport.getScrollOffsets();
        var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
        var lightboxLeft = arrayPageScroll[0] + (arrayPageSize[0] / 2) - (970 / 2);

        $('kbrewescustomizer-lightbox-'+products_id).setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' });
}

function closekrewesCustomizerLightbox(products_id, real_products_id) {

	new Effect.Fade('kbrewescustomizer-overlay-'+products_id, { duration: 0.2 });
	$('kbrewescustomizer-lightbox-'+products_id).hide();
	xajax_kbrewesCustomizer.closeLightbox( real_products_id );
}

function getPageSize() {
		
	var xScroll, yScroll;
		
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = window.innerWidth + window.scrollMaxX;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	
	if (self.innerHeight) {	// all except Explorer
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			windowWidth = self.innerWidth;
		}
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = xScroll;		
	} else {
		pageWidth = windowWidth;
	}

	return [pageWidth,pageHeight];
}