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 getCoordFoModal(id)
{
	var arrPageSizes = getPageSize();
	var center = arrPageSizes[0]/2;
	var halfModal = $('#'+id).width()/2;
	
	return parseInt(center-halfModal);
}

function overlayOn()
{
	var arrPageSizes = getPageSize();
	$('#overlay').css({
		backgroundColor:	"#000",
		opacity:			0.8,
		width:				arrPageSizes[0],
		height:				arrPageSizes[1]
	}).fadeIn();
	
}
function overlayOff()
{
	$('.modal').hide();
	$('#overlay').fadeOut();
}

function showModal(id, load)
{
	if (load!='')
	{
		$("#"+id).load(load);
	}
	$("#"+id).css({
		top:200,
		left:getCoordFoModal(id)	
	}).show();
}