// JavaScript Document
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 opaque = (opacity / 100);
  var bgcolor = options.bgcolor || '#000000';
  var dark=document.getElementById('darkenScreenObject');
  var msgBox=document.getElementById('messageBox');
  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 msgWidth = document.body.scrollWidth;
        var pageHeight = document.body.scrollHeight+'px';
    } else if( document.body.offsetWidth ) {
     	var pageWidth = document.body.offsetWidth+'px';
		var msgWidth = document.body.offsetWidth;
     	var pageHeight = document.body.offsetHeight+'px';
    } else {
       var pageWidth='100%';
       var msgWidth = 800;
	   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';
	
	if (!msgBox) {
		var bbody = document.getElementsByTagName("body")[0];
		var bnode = document.createElement('div');           // Create the layer.
			bnode.style.position='absolute';                 // Position absolutely
			bnode.style.top='184px';                           // In the top
			bnode.style.left=((msgWidth / 2) - 174)+'px';                          // Left corner of the page
			//bnode.style.left=(bnode.style.left / 2)
			//bnode.style.left=(bnode.style.left - 174);                          // Left corner of the page
			bnode.style.overflow='hidden';                   // Try to avoid making scroll bars            
			bnode.style.display='block';                      // Start out Hidden
			bnode.style.width='348px';
			bnode.style.height='210px';
			bnode.style.backgroundColor='#ffffff';
			bnode.id='messageBox';                   // Name it so we can find it later
			bnode.style.zIndex=zindex+50;
			
			bnode.style.backgroundImage  = "url(/images/popup.jpg)";
			
		bbody.appendChild(bnode);                            // Add it to the web page
		msgBox=document.getElementById('messageBox');  // Get the object.
	}
	msgBox.innerHTML="<div style='width:328px; height:190px; text-align:center; padding:10px;'><font color='#005faa' style='font-size:30px; font-weight:bold;'>&nbsp;<br />CHECKOUT BASKET NOW LIVE!</font><br />&nbsp;<br />&nbsp;<br /><input type='button' onclick='grayOut(false)' value='Close' /></div>";
    msgBox.style.display='block';
	
  } else {
     dark.style.display='none';
	 msgBox.style.display='none';
  }
}