// JavaScript Document

function initializeGlobals() {
	
}


//Other Functionality
function ShowContent(tag) {
	var el = document.getElementById(tag);
	el.style.display = 'block';
}

function HideContent(tag) {
	var el = document.getElementById(tag);
	el.style.display = 'none';
}

function ClearContent(tag) {
	var el  = document.getElementById(tag);
	el.innerHTML = '';
}

function findPos(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	return [curleft,curtop];
}

function posCenter(obj) {
	var bubble = obj;	
	var bubbleh = bubble.offsetHeight;
	var bubblew = bubble.offsetWidth;
	if (document.documentElement.scrollTop) {
		var xOffset = document.documentElement.scrollLeft;
		var yOffset = document.documentElement.scrollTop;
	} else {
		var xOffset = document.body.scrollLeft;
		var yOffset = document.body.scrollTop;
	}
	if (window.innerWidth) {
		var xExtra = window.innerWidth;
		var yExtra = window.innerHeight;
	} else {
		if (document.documentElement.clientWidth) {
			var xExtra = document.documentElement.clientWidth;
			var yExtra = document.documentElement.clientHeight;
		} else {
			var xExtra = document.body.clientWidth;
			var yExtra = document.body.clientHeight;
		}
	}
	
	xExtra = (xExtra - bubblew) / 2;
	yExtra = (yExtra - bubbleh) / 2;
	var x = xExtra + xOffset;
	var y = yExtra + yOffset;
	bubble.style.top = y +"px";
	bubble.style.left = x +"px";
}

function grayOut(vis, options) {
  // Credit: http://www.hunlock.com/blogs/Snippets:_Howto_Grey-Out_The_Screen
  // 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 || 10000;
  var opacity = options.opacity || 80;
  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';
  }
}