// JavaScript Document
// JavaScript Document

function grayOut(divelem,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 gspMain = document.getElementById('gspmain');
  var centerColumn = document.getElementById('center-columns');



  var dlg = document.getElementById(divelem) ; 

  var options = options || {}; 
  var zindex = options.zindex || 50;
  var opacity = options.opacity || 60;
  var opaque = (opacity / 100);
  var bgcolor = options.bgcolor || '#000';
  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.
	dlg.style.display = "block"
  }
  if (vis) {
	gspMain.style.overflow='visible';
	centerColumn.style.overflow='visible';
    // Calculate the page width and height 

	var pageHeight = '';
	var pageWidth = '';
    if (window.innerHeight && window.scrollMaxY) {// Firefox

		pageHeight = window.innerHeight + window.scrollMaxY;
		pageWidth = window.innerWidth + window.scrollMaxX - 17;

	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		pageHeight = document.body.scrollHeight;
		pageWidth = document.body.scrollWidth;
	} else { // works in Explorer 6 Strict, Mozilla (not FF) and Safari
		pageHeight = document.body.offsetHeight;
		pageWidth = document.body.offsetWidth;
  	}

    //var pageWidth='100%';
    //var pageHeight='100%'; 
	var pageHeight1 =document.body.scrollHeight;
    var pageHeight2 =document.body.offsetHeight;
	//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; 
	if( pageHeight1 < pageHeight2 ) 
	{
    	dark.style.width= pageWidth + 'px';
    	dark.style.height= pageHeight2 + 10 + 'px';
	}
	else
	{
		dark.style.width= pageWidth + 'px';
    	dark.style.height= pageHeight + 'px';
	}
    dark.style.display='block';
	dlg.style.display = "block";				 
  } else {

		gspMain.style.overflow='hidden';
		centerColumn.style.overflow='hidden';
     dark.style.display='none';
	 dlg.style.display = "none";
  }
}