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 || 70;  
	var opaque = (opacity / 100);  
	var bgcolor = options.bgcolor || '#000000';  
	var dark=document.getElementById('darkenScreenObject');  
	if (!dark) 
	{    
		// The dark layer doesn't exist, it's never been created.  So we'll    
		// create it here and apply some basic styles.    
		// If you are getting errors in IE see: http://support.microsoft.com/default.aspx/kb/927917    
		var tbody = document.getElementsByTagName("body")[0];    
		var tnode = document.createElement('div');           // Create the layer.        
			tnode.style.position='absolute';                 // Position absolutely        
			tnode.style.top='0px';                           // In the top        
			tnode.style.left='0px';                          // Left corner of the page        
			tnode.style.overflow='hidden';                   // Try to avoid making scroll bars                    
			tnode.style.display='none';                      // Start out Hidden        
			tnode.id='darkenScreenObject';                   // Name it so we can find it later    
		tbody.appendChild(tnode);                            // Add it to the web page    
		dark=document.getElementById('darkenScreenObject');  // Get the object.  
	}  
	
	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 showImageLayer(show,urlImage)
{
	var image = document.getElementById('imageScreenObject');  
	
	//alert(urlImage);
	
	if (show)
	{
		// Calculate the page width and height     
		var pageHeight = document.body.clientHeight;
		var pageWidth = document.body.clientWidth;
		
		//now position the image around the centre of the page
		image.style.top = ((pageHeight/2) - 175 + document.body.scrollTop) + 'px';
		image.style.left = ((pageWidth/2) - 250 + document.body.scrollLeft) + 'px';

		image.style.opacity=100;                          
		image.style.MozOpacity=1;                       
		//image.style.filter='alpha(opacity='+opacity+')';     
		image.style.zIndex=51; 
				     
		//load up image to display
		var newImg = new Image();
		newImg.src = urlImage;	//'http://127.0.0.1/jcbcea/products/ADT714/714.jpg';

		//show the image layer
		image.style.display='block';   
		
		document.images["imageToShow"].src = newImg.src;
		//document.images["imageToShow"].width = newImg.width;
		//document.images["imageToShow"].height = newImg.height;
		
		//alert ('The image size is '+width+'*'+height + '*' + newImg.src);
		
		//image.style.backgroundImage = "url(" + newImg.src + ")";	//"url('http://www.cea.net.au/jcbcea/images/TruckThumb.jpg')";
		//image.style.backgroundRepeat = 'no-repeat';
		
		
		
	}
	else
	{
		image.style.display='none';   
	}
}

function showImage(urlImage)
{
	grayOut(true);
	showImageLayer(true,urlImage);
	
}

function hideImage()
{
	showImageLayer(false);
	grayOut(false);
}