/**
 Used with ExpandableDivElement.
 
 08-Feb-16: Add cookies. Now requires prototype.js.
 08-Jul-28: Add guaranteeExpandDiv.
 09-Dec-16: Use Blind effects instead of show/hide. (Note: Slide effect does not work on nested/AJAX divs)
 
**/

function collapseOrExpandDiv(divName, imgName, colImgPath, expImgPath) {
	var el = document.getElementById(divName);
	var img = document.getElementById(imgName);
	if ( el.style.display != 'none' ) {
	Effect.BlindUp(el);
	//	el.style.display = 'none';
		document.images[imgName].src = colImgPath;
		storeExpandableDivCookie(divName, false);
	}
	else {
		// el.style.display = 'block';
		Effect.BlindDown(el);
		document.images[imgName].src = expImgPath;
		storeExpandableDivCookie(divName, true);
	}
}

function guaranteeExpandDiv(divName, imgName, colImgPath, expImgPath) {
	var el = document.getElementById(divName);
	if( el.style.display == 'none') {
		collapseOrExpandDiv(divName, imgName, colImgPath, expImgPath);
	}
}

function storeExpandableDivCookie(folderID, isExpanded) {
	var cookieName = 'gse_expandedDivs';
	var c = getCookie(cookieName);
	var parts;
	if(c == null) {
		parts = new Array();
	} else {
		parts = c.split(',');
	}
  	// turn it into unique values array
	parts = parts.uniq(); // requires prototype.js
	// if expanded, add id; otherwise, remove it
	if(isExpanded) {
		parts.push(folderID);
	} else {
		parts = parts.without(folderID); // requires prototype.js
	}
	// turn the array back to a csv
	var val = parts.join(',');
	setCookie(cookieName, val, 1);
}