// stolen from lightbox
function getPageDimensions(){

	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];
}

originalBodyOverFlowMode = '';

// stolen from lightbox
function createLayover()
{
	var objBody = $$('body')[0];
	originalBodyOverFlowMode = objBody.style.overflow;
    objBody.style.overflow = 'hidden';
	objBody.appendChild(Builder.node('div',{id:'overlay'}));
	$('overlay').setOpacity(0);
	var arrayPageSize = getPageDimensions();
	$('overlay').setStyle({ width: (arrayPageSize[0]+200) + 'px', height: (arrayPageSize[1]+200) + 'px' });	
	new Effect.Appear($('overlay'), { duration: 0.6, from: 0.0, to: 0.8 });	
	$('layover').setStyle({display: 'block'});
	$('layover').setOpacity(0);
	
	var layOverMargin = 20;
	var layOverWidth  = document.viewport.getWidth()-(2*layOverMargin);
	var layOverHeight = document.viewport.getHeight()-(2*layOverMargin);
	
	var arrayPageScroll = document.viewport.getScrollOffsets();
	var layOverTop = arrayPageScroll[1] + layOverMargin;
    var layOverLeft = arrayPageScroll[0]+((arrayPageSize[0]/2)-(layOverWidth/2));
    
    $('layover').setStyle({ top: layOverTop + 'px', left: layOverLeft + 'px' });    
    $('layover').setStyle({ width: layOverWidth + 'px', height: layOverHeight + 'px' });    
    setTimeout("new Effect.Appear($('layover'), { duration: 0.6, from: 0.0, to: 1.0 })",600);
}

function closeLayover()
{	
	var objBody = $$('body')[0];
	new Effect.Fade($('layover'), { duration: 0.6, from: 1.0, to: 0.0 })
	setTimeout("new Effect.Fade($('overlay'), { duration: 0.8 })",600);
    objBody.style.overflow = originalBodyOverFlowMode;

}