function gray_out(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
	// gray_out(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 show_full(gallery_id) {
		gray_out(true);

		var full = document.getElementById('full-' + gallery_id);

//		if(!full) {
//			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 = 'full-image';                         // Name it so we can find it later
//			tbody.appendChild(tnode);                            // Add it to the web page
//			full=document.getElementById('full-image');  // Get the object.
//		}

//		full.style.zIndex = 100;
//		full.style.backgroundColor = '#ececec';
//		full.style.width = '436px';
//		full.style.height = '419px';
		full.style.display = 'block';
	}

	function hide_full(gallery_id) {
		var full = document.getElementById('full-' + gallery_id);

		full.style.display = 'none';

		gray_out(false);
	}