/*
 Outliner functions
 http://www.irt.org/articles/cgi.htm
 via Aaron Straup Cope <http://aaronland.info/weblog/today>
*/

function expand(ioNode) {
    ioWedge = "i" + ioNode.substr(1);															// compute wedge image id

	if (document.getElementById && document.getElementById(ioNode) != null) {					// show W3C DOM style
		document.getElementById(ioWedge).src='http://radio.weblogs.com/0104487/gems/activeRenderer/ol2.gif';
		document.getElementById(ioWedge).title='collapse';
		document.getElementById(ioNode).style.visibility='visible';
		document.getElementById(ioNode).style.display='block';
    }

    else if (document.all) {																	// show IE4 style
        document.all[ioNode].style.zIndex = 100;
        document.all[ioNode].style.visibility = 'visible';
        document.all[ioWedge].src='http://radio.weblogs.com/0104487/gems/activeRenderer/ol2.gif';
		document.all[ioWedge].title='collapse';
    }

    else if (document.layers && document.layers[ioNode] != null) {								// show NS4 style
        document.layers[ioNode].visibility = 'visible';
        document.layers[ioWedge].src='http://radio.weblogs.com/0104487/gems/activeRenderer/ol2.gif';
		document.layers[ioWedge].title='collapse';
    }
}

function collapse(ioNode) {
    ioWedge = "i" + ioNode.substr(1);															// compute wedge image id

    if (document.getElementById && document.getElementById(ioNode) !=  null) {					// hide W3C DOM style
		document.getElementById(ioWedge).src='http://radio.weblogs.com/0104487/gems/activeRenderer/ol3.gif';
		document.getElementById(ioWedge).title='expand';
		document.getElementById(ioNode).style.visibility='hidden';
		document.getElementById(ioNode).style.display='none';
    }
	
    else if (document.all) {																	// hide IE4 style
		document.all[ioNode].style.visibility = 'hidden';
		document.all[ioWedge].src='http://radio.weblogs.com/0104487/gems/activeRenderer/ol3.gif';
		document.all[ioWedge].title='expand';
    }

    else if (document.layers && document.layers[ioNode] != null) {								// hide NS4 style
		document.layers[ioNode].visibility = 'hidden';
        document.layers[ioWedge].src='http://radio.weblogs.com/0104487/gems/activeRenderer/ol3.gif';
        document.layers[ioWedge].title='expand';
    }
}

function ioSwitch(ioNode) {

    if (document.getElementById && document.getElementById(ioNode) !=  null) {					// test W3C DOM style
    	nodeState = document.getElementById(ioNode).style.display;
    }

    else if (document.all) {																	// test IE4 style
    	nodeState = document.all[ioNode].style.visibility;
	}

    else if (document.layers && document.layers[ioNode] != null) {								// test NS4 style
    	nodeState = document.layers[ioNode].visibility;
    }

    if ((nodeState == 'none') || (nodeState == 'hidden')) {										// expand if collapsed
       	expand(ioNode);
    }

    else {																						// collapse if expanded
    	collapse(ioNode);
	}
}

function expandAll(divName) {

	nodeList = document.getElementsByName(divName);

	if (nodeList.length > 0) {

		for (var i = 0; i < nodeList.length; i++) {												// loop through all collapsable nodes
			expand(nodeList.item(i).id);														// expand each node identified by id
		}
	}

	else {
		nodeList = document.getElementsByTagName('div');
		
		if (nodeList.length > 0) {

			for (var i = 0; i < nodeList.length; i++) {											// loop through all divs
			
				if (nodeList.item(i).name == divName) {											// Select divs with names matching parameter
					expand(nodeList.item(i).id);												// expand each node identified by id
				}
			}

		}

		else {
			alert ("Oops, your browser is not DOM level 1 compatible, sorry.");
		}
	}
}

function collapseAll(divName) {																	// only works with HTML in W3C DOM

	nodeList = document.getElementsByName(divName);

	if (nodeList.length > 0) {

		for (var i = 0; i < nodeList.length; i++) {												// loop through all collapsable nodes
			collapse(nodeList.item(i).id);														// collapse each node identified by id
		}
	}

	else {
		nodeList = document.getElementsByTagName('div');
		
		if (nodeList.length > 0) {

			for (var i = 0; i < nodeList.length; i++) {											// loop through all divs
			
				if (nodeList.item(i).name == divName) {											// Select divs with names matching parameter
					collapse(nodeList.item(i).id);												// collapse each node identified by id
				}
			}

		}

		else {
			alert ("Oops, your browser is not DOM level 1 compatible, sorry.");
		}
	}
}