/**
  author: daniel bulli
  wgbh interactive
  **/
var parentwin = null;

function load_in_parent(a_tag)
{

	if (!a_tag) return true;


    if (window.opener && !window.opener.closed)
    {
        parentwin = window.opener;
        parentwin.location = a_tag.href;
        parentwin.focus();
    }
    else if(parentwin)
    {
        parentwin.location = a_tag.href;
        parentwin.focus();
    }
    else
    {
        parentwin = window.open(a_tag.href, 'large_win');
    }

	
}

/** sets nav hot and removes class for roll over **/
function nav_set_hot(li_id) 
{
    //if we don't support getElementById then exit
	if (!document.getElementById) return
	
	if(document.getElementById('p-'+li_id)) {
	
	//grab image
	var ls_images = document.getElementById('p-'+li_id).getElementsByTagName("img");

    //loop over images (should be only 1)
	for (var i = 0; i < ls_images.length; i++)
	{
	    //grab src
	    var src = ls_images[i].getAttribute('src');
	    var ftype = src.substring(src.lastIndexOf('.'), src.length);

        //set hot
	    ls_images[i].setAttribute('src', src.replace(ftype, '_over'+ftype));

	    //remove rollover
	    ls_images[i].className = "";
    }
    }

    return expert_prev_next(); 

}

/**  activates or turns off prev/next **/
function expert_prev_next(li_id) 
{
    //let's do back/forward button (list and href)
    if (!document.getElementById('p-gb') && !document.getElementById('ex-goback') && !document.getElementById('ex-goon')) return;

    var a_goback = document.getElementById('ex-goback');
    var a_goon   = document.getElementById('ex-goon');

    //if no previous then remove
    if(a_goback.getAttribute('href') == '#')
    {
        var li_goback = document.getElementById('p-gb');
        li_goback.innerHTML = '<img src="../../i/matters/back_disable.gif" class="i_fleft" alt="" width="77" height="20" border="0" />';
    }
   	if(a_goon.getAttribute('href') == '#')
    {
        var li_goon= document.getElementById('p-go');
        li_goon.innerHTML = '<img src="../../i/matters/goon_disable.gif" class="i_fleft" alt="" width="60" height="20" border="0" />';
    }
}


/** note this puts roll over on image, not href **/
function initPopRoll()
{
    //if we don't support getElementById then exit
	if (!document.getElementById) return
	
	//yes it even does preload
	var aPreLoad = new Array();
	var aImages  = new Array();
	var sTempSrc;
	

    //nb if you want all images on page  you do this instead (i only wanted nav)
    var aImages = document.getElementsByTagName("img");


    //loop over images
	for (var i = 0; i < aImages.length; i++)
	{	
	    //we use class name to find image	
		if (aImages[i].className.match('p-o'))
		{
		    //grab src
			var src = aImages[i].getAttribute('src');

			//grab extension (neato works for gif and jpg nd png if you so feel)
			var ftype = src.substring(src.lastIndexOf('.'), src.length);

			//create a new attribute for rollover (for fyi = '-over')
			var hsrc = src.replace(ftype, '_over'+ftype);
			aImages[i].setAttribute('hsrc', hsrc);

			//PRELOAD !!
			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;

			//on mouseover grab hsrc
			aImages[i].onmouseover = function()
			{
				sTempSrc = this.getAttribute('src');
				this.setAttribute('src', this.getAttribute('hsrc'));
			}	

			//on mouse out strip out "on"
			aImages[i].onmouseout = function()
			{
			    //alert(sTempSrc);
				if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_on'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}

/** puts pop ups on hrefs that need **/
function videoplayer(a_tag)
{
    //if we don't support getElementById then exit
	if (!a_tag) return true;
	
    window.open(a_tag.href, 'horiz', 'width=431,height=570,toolbar=0,location=0,status=0,menubar=0,scrollbars=0,resizable=1'); return false;
    return false;
}