//This function is used to gray out the screen and display a floating box over it

function grayOut(vis, options, extra, stringtext) {
	
	// set defaults
	var background = 'url(/assets/images/hp_overlay/cat_bg.png)';
	var htmlstring = "<div class='pledgenow'><a href='https://secure.calvary.edu/care-a-thon-donation'>&nbsp;</a></div>";
	htmlstring += "<div class='total'>" + stringtext + "</div>";
	htmlstring += "<div class='learn'><a href='/carathon'>&nbsp;</a></div>";
	htmlstring += "<div class='home'><a onClick='grayOut(false)'>&nbsp;</a></div>";
	
  // 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');
  var myLoc = document.location; 
    //stringtext used to pass through Pledge totals from CAT db. Variable is loaded in /inc/header.php
  var stringtext = stringtext || 'Sample text';
  var startDate=new Date();
  	//set Careathon start date (yyyy,m-1,d-1)
     startDate.setFullYear(2010,3,4);
  var endDate=new Date();
    //set Careathon end date (yyyy,m-1,d+1)
     endDate.setFullYear(2010,3,10);
  var today = new Date();
  //First lets check so see if this is the homepage between valid dates or homepage with blank anchor for testing
  if ((myLoc == "http://kljc.calvary.edu/" && today>startDate && today<endDate) || (myLoc == "http://kljc.calvary.edu/#A")) {
  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
		
	var msgnode = document.createElement('div');           // Create the box layer.
		msgnode.style.position='fixed';                 // Position fixed
        msgnode.style.display='none';                      // Start out Hidden
        msgnode.id='box';                   				// Name it so we can find it later
		// give it a size and align it to center
		msgnode.style.width = "550px";
		msgnode.style.height = "600px";
		msgnode.style.marginLeft= "-300px";      
		msgnode.style.marginTop= "-300px"; 
		msgnode.style.textAlign = 'center';
		msgnode.style.top= "50%";                           // In the top	
		msgnode.style.left="50%";                          // Left corner of the page	
	tbody.appendChild(msgnode);                            // Add it to the grey screen
    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';  
	if(extra == 'Y')
		document.body.style.overflow =  'hidden';
		
	document.getElementById("box").style.zIndex = zindex+10;
	document.getElementById("box").style.border = "#000 solid 1px";
	document.getElementById("box").style.display = "block";
		

	document.getElementById("box").onclick = function() //attach a event handler to hide both div
	{
		//dark.style.display="none";
		//document.getElementById("box").style.display = "none";
		//document.body.style.overflow = 'auto';
		
	}
	//document.getElementById("box").style.backgroundColor="#FFF";
	document.getElementById("box").style.backgroundImage = background;
	document.getElementById("box").innerHTML = htmlstring;
  } else {
     dark.style.display='none';
	 document.getElementById("box").style.display = "none";
	 document.body.style.overflow = 'auto';
  }
}
else {
	return false;
}
}