function openPopOver(){
	// drawOverlay();
	
	var popOver = document.createElement("popOver");
	popOver.setAttribute('id','popOver');
	document.body.appendChild(popOver);
	
	/*
	new Ajax.Updater('popOver','ajax/popOver_draw.cfm', {
	  evalScripts: true,
	  method: 'post',
	  parameters:  {  }
	});
	*/
	
	var arrayPageScroll = document.viewport.getScrollOffsets();
	var arrayPageSize = document.viewport.getDimensions();
	var boxTop = arrayPageSize.height/2 - ($('popOver').getHeight() / 2) + arrayPageScroll[1];
	var boxLeft = arrayPageSize.width/2 - ($('popOver').getWidth() / 2);
	$('popOver').setStyle({ top: boxTop + 'px', left: boxLeft + 'px', display:'block' });
	
	// Effect.Appear('popOver', {duration:0.2, delay:0.4});
}


function closeOverlay(){
	// $('overlayer').remove();
	$('popOver').remove();
}


function drawOverlay(){
	var overlayer = document.createElement("overlayer");
	overlayer.setAttribute('id','overlayer');
	document.body.appendChild(overlayer);
	var arrayPageSize = getPageSize();
	alert(arrayPageSize[0]);
    $('overlayer').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });
	Effect.Appear('overlayer', {duration:0.4, from:0, to:0.7});
	$('overlayer').observe('click', closeOverlay);
}

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;
	}

	return [pageWidth,pageHeight];
}