function initialiseNavElements() {
	// highlight the current page
	var location = initialiseNavLocation();
	var divs = document.getElementsByTagName('DIV');
	for (j = 0; j < divs.length; j++) {
		var childrenAnchors = divs[j].getElementsByTagName('A');
		for (var k = 0; k < childrenAnchors.length; k++) {
			if (childrenAnchors[k] == location) {
				childrenAnchors[k].parentNode.className = 'currentPage';
			}
		}
	}
}

function showHideChildren(shElement) {
	// toggle visibility of an element's children
	var children = shElement.childNodes;
	for (var j = 0; j < children.length; j++) {
		var child = children[j];
		if (child.nodeName == 'DIV') {
			var myClassName = (child.className ? child.className : '');
			if (myClassName.indexOf('hide') > -1) {
				child.className = child.className.replace('hide',' ');
			}
			else {
				child.className = myClassName + ' hide ';
			}
		}
	}
}

function initialiseNavLocation() {
	var location = document.URL;
	if (location.indexOf('?') > -1) {
		location = location.slice(0,location.indexOf('?'));
	}
	if (location[location.length-1] == '/') {
		location = location.slice(0,-1);
	}
	return location;
}

function onLoadFuncs() {
	// things to run when the page loads
	initialiseNavElements();
	initialiseDrag();
	try {
		svgURL;
		onLoadSVGFuncs();
	}
	catch (e) {}
}

onload = onLoadFuncs;