function showBlock(what) {
	document.getElementById(what).style.display = 'block';
}

function showInline(what) {
	document.getElementById(what).style.display = 'inline';
}

function hide(what) {
	document.getElementById(what).style.display = 'none';
}

function toggleBlock(what) {
	if (document.getElementById(what).style.display == 'none') {
		showBlock(what);
	}
	else {
		hide(what);
	}
}
function toggleInline(what) {
	if (document.getElementById(what).style.display == 'none') {
		showInline(what);
	}
	else {
		hide(what);
	}
}

function showLightbox(id) {
	if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)) {
		var ieversion = new Number(RegExp.$1);
		if ((ieversion >= 6) || (ieversion >= 5)) {
			window.scrollTo(0,0);
		}
	}
	showBlock('overlay');
	showBlock(id);
}

function hideLightbox(id) {
	hide('overlay');
	hide(id);
}

function changeImageSrc(id) {
	document.getElementById('imageChange').src='' + id + ''; 
}

var getElementsByClassName = function (className, tag, elm) {
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className), 
			nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
			returnElements = [],
			current;
			for (var i=0, il=elements.length; i<il; i+=1) {
				current = elements[i];
				if (!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "), 
			classesToCheck = "",
			xhtmlNamespace = "http://www.w3.org/1999/xhtml",
			namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
			returnElements = [],
			elements,
			node;
			for (var j=0, jl=classes.length; j<jl; j+=1) {
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
			classesToCheck = [],
			elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
			current,
			returnElements = [],
			match;
			for (var k=0, kl=classes.length; k<kl; k+=1) {
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for (var l=0, ll=elements.length; l<ll; l+=1) {
				current = elements[l];
				match = false;
				for (var m=0, ml=classesToCheck.length; m<ml; m+=1) {
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};