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 + 20 +'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 display(src, off_x, off_y) {
	grayOut(true);
	wdwdim = getWindowDimension();
	offset = getScrollXY();
	var tbody = document.getElementsByTagName("body")[0];
	var img = document.createElement('img');           
		img.style.position='absolute';                 
		img.style.top=(offset[1] + off_y) + 'px';         
		img.style.left=(offset[0] + off_x) + 'px';        
		img.style.overflow='hidden';                   
		img.style.display='block';                     
		img.id='imagex';
		img.style.zIndex = 51;
		if (typeof src == 'string') {
			img.src=src.replace("t_", "");			
		} else {
			img.src=src.src.replace("t_", "");
		}
		img.onclick=new Function("remove('" + this + "')");
		img.style.maxWidth=wdwdim[0] - 80 + "px";
		img.style.maxHeight=wdwdim[1] - 80 + "px";
	tbody.appendChild(img);                            
	dbgelm = document.getElementById('debug');
}
function remove(src) {
    var tbody = document.getElementsByTagName("body")[0];
    var node = document.getElementById('imagex');
    tbody.removeChild(node);                   
	grayOut(false);
}
function getScrollXY() {
	var scrOfX = 0, scrOfY = 0;
  	if( typeof( window.pageYOffset ) == 'number' ) {
    	//Netscape compliant
    	scrOfY = window.pageYOffset;
    	scrOfX = window.pageXOffset;
  	} else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
	    //DOM compliant
	    scrOfY = document.body.scrollTop;
	    scrOfX = document.body.scrollLeft;
	} else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop )) {
	    //IE6 standards compliant mode
    	scrOfY = document.documentElement.scrollTop;
    	scrOfX = document.documentElement.scrollLeft;
	}
  	return [ scrOfX, scrOfY ];
}
function getWindowDimension() {
	var viewportwidth;
	var viewportheight;
	if (typeof window.innerWidth != 'undefined') {
		debugText = "window.innerWidth";
		viewportwidth = window.innerWidth;
		viewportheight = window.innerHeight;
	} else if (typeof document.documentElement != 'undefined'
     		&& typeof document.documentElement.clientWidth !=
     		'undefined' && document.documentElement.clientWidth != 0) {
		viewportwidth = document.documentElement.clientWidth;
		viewportheight = document.documentElement.clientHeight;	
	} else {
		viewportwidth = document.getElementsByTagName('body')[0].clientWidth;
		viewportheight = document.getElementsByTagName('body')[0].clientHeight;		
	}
	return [ viewportwidth, viewportheight ]; 
}