/**
 / THIRD FUNCTION
 * getPageSize() by quirksmode.com
 *
 * @return Array Return an array with page width, height and window width, height
 */
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;
	}
	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
	return arrayPageSize;
};

function makeOverlay(callback) {
    $('body').append('<div id="overlay"></div>');
    
    var arrPageSizes = ___getPageSize();

    // Style overlay  and show it
    $('#overlay').css({
		'opacity':			'0.90',
		'width':			arrPageSizes[0] + 'px',
		'height':			arrPageSizes[1] + 'px',
		'position':			'absolute',
		'top':				'0px',
		'left':				'0px',
		'z-index':			'99',
		'background-color':	'#000000'
	}).fadeIn('fast', function() {
        callback();
    });
}

function removeOverlay() {
    $('#overlay').fadeOut(function() { $('#overlay').remove(); });
}


/*makeOverlay(function() {
	// Codigo que você quer executar.
})*/

//removeOverlay()