jQuery.fn.fadeIn = function(speed, callback) { 
    return this.animate({opacity: 'show'}, speed, function() { 
        if (jQuery.browser.msie)  
            this.style.removeAttribute('filter');  
        if (jQuery.isFunction(callback)) 
            callback();  
    }); 
}; 

function overlay(){
	
  pageSize = getPageSize();
  
  pageWidth = pageSize[0];
  pageHeight = pageSize[1];
  
    var browserName=navigator.appName; 
	var browserVer=parseInt(navigator.appVersion); 
	if ((browserName=="Microsoft Internet Explorer" && browserVer<7)){ 

	  var scrollTop = window.pageYOffset || document.documentElement.scrollTop || 0; 
	  var scrollLeft = window.pageXOffset || document.documentElement.scrollLeft || 0;	
	
	  document.getElementById('overlayDiv').style.top=scrollTop  +"px";
	  document.getElementById('overlayDiv').style.left=scrollLeft +"px";
	}
  
  document.getElementById('overlayDiv').style.width=pageWidth+"px";
  document.getElementById('overlayDiv').style.height=pageHeight+"px";  
  
  //Effect.Appear('overlayDiv', { duration: 0.1, from: 0.0, to: 0.8, afterFinish: checkCaptcha});
  $('#overlayDiv').fadeIn("normal", function(){checkCaptcha()});
}

function overlayOff(){
  //Effect.Appear('overlayDiv', { duration: 0.1, from: 0.8, to: 0.0, afterFinish: hideLayer });
  $('#overlayDiv').fadeOut("normal", function(){hideLayer()});
}

function hideLayer(){
	//document.getElementById('overlayDiv').style.display="none";
}

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];
}