// toggle hide and display, switch graphics
function toggleLayer(whichLayer,imgObj, returnStatus)
{
	// switch images
	img = getObject(imgObj);
	if(img.src.indexOf("images/button_minus.gif") != -1) {
		var new_src = img.src.replace("button_minus.gif","button_plus.gif")
        img.src = new_src;
	}
	else if (img.src.indexOf("images/button_plus.gif") != -1) {
		var new_src = img.src.replace("button_plus.gif","button_minus.gif")
        img.src = new_src;
	}
	else if (img.src.indexOf("images/button_plus_small.gif") != -1) {
		var new_src = img.src.replace("button_plus_small.gif","button_minus_small.gif")
        img.src = new_src;
	}
	else if (img.src.indexOf("images/button_minus_small.gif") != -1) {
		var new_src = img.src.replace("button_minus_small.gif","button_plus_small.gif")
        img.src = new_src;
	}
	else if (img.src.indexOf("images/button_plus_green.gif") != -1) {
		var new_src = img.src.replace("button_plus_green.gif","button_minus_green.gif")
        img.src = new_src;
	}
	else if (img.src.indexOf("images/button_minus_green.gif") != -1) {
		var new_src = img.src.replace("button_minus_green.gif","button_plus_green.gif")
        img.src = new_src;
	}
	// toggle layer visibility
	var elem, vis;  
	if( document.getElementById ) // this is the way the standards work    
		elem = document.getElementById( whichLayer );  
	else if( document.all ) // this is the way old msie versions work      
		elem = document.all[whichLayer];  
	else if( document.layers ) // this is the way nn4 works    
		elem = document.layers[whichLayer];  
	vis = elem.style;  // if the style.display value is blank we try to figure it out here  
	if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)    
		vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';  
		vis.display = (vis.display==''||vis.display=='block')?'none':'block';

    if(returnStatus=='true')
    {
        if (vis.display=='block')
            return true;
        else
            return false;
    }
}


//
//function expandAll(prefix,numberOfElements) {
//	for(var i = 1; i <= numberOfElements; i++) {
//		showLayer = getObject(prefix + i);
//		imgLayer = getObject(prefix + i + "img");
//		// if closed, open the panel
//		if(showLayer.style.display=='none'||showLayer.style.display=='')
//		{
//			toggleLayer((prefix + i),(prefix + i + "img"));
//		}
//	}
//}
//
//function collapseAll(prefix,numberOfElements) {
//	for(var i = 1; i <= numberOfElements; i++) {
//		showLayer = getObject(prefix + i);
//		imgLayer = getObject(prefix + i + "img");
//		// if open, close the panel
//		if(showLayer.style.display=='block')
//		{
//			toggleLayer((prefix + i),(prefix + i + "img"));
//		}
//	}
//}

function expandAll() {
	var elements = $$('.browseDesc')
//    alert(elements.length)
    for(var i = 0; i < elements.length; i++) {
		showLayer = elements[i];
//      alert(showLayer.id)
        imgLayer = getObject(showLayer.id+ "_img");
//        alert (imgLayer.id)
        // if closed, open the panel
		if(showLayer.style.display=='none'||showLayer.style.display=='')
		{
			toggleLayer(showLayer.id, imgLayer.id);
		}
	}
}

function collapseAll() {
    	var elements = $$('.browseDesc')
    for(var i = 0; i < elements.length; i++) {
		showLayer = elements[i];
		imgLayer = getObject(showLayer.id+ "_img");
		// if open, close the panel
		if(showLayer.style.display=='block')
		{
			toggleLayer(showLayer.id, imgLayer.id);
		}
	}
}