function grayOut(vis, options) 
{  
	// Pass true to gray out screen, false to ungray  
	// options are optional.  This is a JSON object with the following (optional) properties  
	// opacity:0-100         
	// Lower number = less grayout higher = more of a blackout   
	// zindex: #             
	// HTML elements with a higher zindex appear on top of the gray out  
	// bgcolor: (#xxxxxx)    
	// Standard RGB Hex color code  
	// grayOut(true, {'zindex':'50', 'bgcolor':'#0000FF', 'opacity':'70'});  
	// Because options is JSON opacity/zindex/bgcolor are all optional and can appear  
	// in any order.  Pass only the properties you need to set.  

	var options = options || {};   
	var zindex = options.zindex || 50;  
	
	var opacity = options.opacity || 50;  
	var bgcolor = options.bgcolor || '#FFFFFF'; 


	var opaque = (opacity / 100);  
	 
	var dark=document.getElementById('divPageTransition');  

	dark.style.position='absolute';                 	// Position absolutely        
	dark.style.top='0px';                           	// In the top        
	dark.style.left='0px';                          	// Left corner of the page        
	dark.style.overflow='hidden';                   	// Try to avoid making scroll bars                    
	dark.style.display='none';                      	// Start out Hidden        	

	if (vis) 
	{    
		// Calculate the page width and height     
		if( document.body && ( document.body.scrollWidth || document.body.scrollHeight ) ) 
		{        
			var pageWidth = document.body.scrollWidth+'px';        
			var pageHeight = document.body.scrollHeight+'px';    
		} 
		else if( document.body.offsetWidth ) 
		{      
			var pageWidth = document.body.offsetWidth+'px';      
			var pageHeight = document.body.offsetHeight+'px';    
		} 
		else {       
			var pageWidth='100%';       
			var pageHeight='100%';    
		}       

		//set the shader to cover the entire page and make it visible.    
		dark.style.opacity=opaque;                          
		dark.style.MozOpacity=opaque;                       
		dark.style.filter='alpha(opacity='+opacity+')';     
		dark.style.zIndex=zindex;            
		dark.style.backgroundColor=bgcolor;      
		dark.style.width= pageWidth;    
		dark.style.height= pageHeight;    
		dark.style.display='block';                            
	} 
	else 
	{     
		dark.style.display='none';  
	}
}

function showPageTransition()
{
	grayOut(true);

	var obj = document.getElementById("tblPageTransition");
	
	if ((window.addEventListener) || (document.addEventListener))
	{
		obj.style.position = "fixed";
		obj.style.top = 10;
	}
	else if (document.all)
	{
		obj.style.position = "absolute";
		obj.style.top = document.body.scrollTop + 100;
	}

	obj.style.left = document.body.scrollLeft + ((document.body.clientWidth - 594) / 2);
	obj.style.display = '';
}

function hidePageTransition()
{
	document.getElementById("tblPageTransition").style.display = "none";
}