function gE(ID) {
	return document.getElementById(ID);
}

function gEs(tag) {
	return document.getElementsByTagName(tag);
}

function LoadBox(divContent){
	exibirBgBody()
	box(divContent)
}

function box(divContent){
	exibirBgBody()
	gE(divContent).style.display = 'block'
	gE('bgBody').style.display = 'block'
}
function CloseBox(divContent){
	gE('bgBody').style.display = 'none'
	gE(divContent).style.display = 'none'
}

function exibirBgBody() {
	var tagBody = gEs('body').item(0);
	var sizesPage = getPageSize();
	var bgBody = document.createElement('div');
	bgBody.setAttribute('id','bgBody');
	bgBody.style.height = arrayPageSize[1] + 'px';
	bgBody.style.width = arrayPageSize[0] + 'px';
	if (!gE('bgBody')) {
		tagBody.insertBefore(bgBody, tagBody.firstChild);
	}	
}

// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
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 + 10;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth - 18;
		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 = windowWidth;
	} else {
		pageWidth = xScroll;
	}

	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
}