function hideSheets() {
	hideLightbox();
	for (var i = 0; i<100; i++) {
		if (document.getElementById) {
			if (document.getElementById("cSheet"+i)!=null) {
				document.getElementById("cSheet"+i).style.display = 'none';
			}
		} else if (document.all) {
			if (document.all["cSheet"+i]!=null) {
				document.all["cSheet"+i].style.display = 'none';
			}
		}
	}
}

function showSheet(id) {
	hideSheets();
	showLightbox();
	if (document.getElementById) {
		var sheet = document.getElementById("cSheet"+id);
	} else if (document.all) {
		var sheet = document.all["cSheet"+id];
	}
	sheet.style.display = 'block';
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		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;
	}	
	sheet.style.left = (windowWidth-sheet.offsetWidth)/2+'px';
	sheet.style.top = (windowHeight-sheet.offsetHeight)/2+'px';
}

function getPageScroll(){
	var yScroll;
	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}
	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}

function getPageSize(){
	var xScroll, yScroll;
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		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
		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;
	}	
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}
	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

function showLightbox() {
	var objOverlay = document.getElementById('overlay');
    swfs = document.getElementsByTagName('object');
    for(i = 0; i < swfs.length; i++) {
        swfs[i].style.visibility = 'hidden';
    }
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';
}

function hideLightbox() {
	objOverlay = document.getElementById('overlay');
    swfs = document.getElementsByTagName('object');
    for(i = 0; i < swfs.length; i++) {
        swfs[i].style.visibility = 'visible';
    }
	objOverlay.style.display = 'none';
}

function initLightbox() {
	var objBody = document.getElementsByTagName("body").item(0);
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	objOverlay.onclick = function () {hideSheets(); return false;}
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0';
	objOverlay.style.left = '0';
	objOverlay.style.zIndex = '90';
 	objOverlay.style.width = '100%';
	objBody.insertBefore(objOverlay, objBody.firstChild);
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
}

function addLoadEvent(func) {	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}
}

addLoadEvent(initLightbox);