var intDivWidth = 20;
var intDivHeight = 20;
var noScroll = false;

function ShowLargeImage()
{
	var strHTML = '';

	scroll(0,0);
	
	noScroll = true;
	grayOut(true);
	
	var objDiv;
	
	objDiv = document.getElementById("div_large_image");
	
	objDiv.style.width = 600 + 'px';
	objDiv.style.height = 600 + 'px';
	
	return;
}

function ReturnToTop()
{
	//returns to the top and disables scrolling if needed
	if (noScroll == true)
	{
		scroll(0, 0);
	}
}

function grayOut(vis, options) {
  var options = options || {}; 
  var zindex = options.zindex || 4;
  var opacity = options.opacity || 70;
  var opaque = (opacity / 100);
  var bgcolor = options.bgcolor || '#000000';
  var dark=document.getElementById('darkenScreenObject');
  if (!dark) {
    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) {
       var pageWidth='100%';
       var pageHeight='100%';
		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';
  }
}