/*
	Developed by Robert Nyman, http://www.robertnyman.com
	Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/
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);
};

function nice()
{
	var forms = getElementsByClassName("flashcard", "fieldset", document.getElementById("content"));

    for (var k=0; k<forms.length; k++)
    {
    	var checks = forms[k].getElementsByTagName('label');
    	var checksLnt = checks.length;

    	for(var i=0; i<checksLnt; i++)
    	{
    		var curr = checks[i];

    		var box = checks[i].firstChild;
    		if (box.nodeName == 'INPUT') {
        		box.className = 'lost';

        		checks[i].className += box.type;
    	    	checks[i].className += (box.checked) ? '-on' : '-off';
            }
            else break;

    		box.onclick = function()
    		{
    			var label = this.parentNode;

    			if(this.type == 'checkbox')
    			{
    				label.className = (label.className.indexOf('-on')+1) ? label.className.replace('-on','-off') : label.className.replace('-off','-on');
    			}

    			if(this.type == 'radio')
    			{
    				var siblings = label.parentNode.parentNode.getElementsByTagName('input');
    				var siblingsLnt = siblings.length;

    				for(var j=0; j<siblingsLnt; j++)
    				{
    					if(siblings[j].name == this.name) {
    						var check = siblings[j].parentNode;
    						check.className = check.className.replace('-on','-off');
    					}
    				}

    				label.className = label.className.replace('-off','-on');
    			}
    		}
    	}

    }
}

function hide_id(nodeId)
{
    var node = document.getElementById(nodeId);
    if (node)
    {
        node.className=node.className.replace('showed', '');
        node.className += ' hidden';
    }
}

function show_id(nodeId)
{
    var node = document.getElementById(nodeId);
    if (node)
    {
        node.className=node.className.replace('hidden', '');
        node.className += ' showed';
    }
}

function toggle_id(nodeId)
{
    var node = document.getElementById(nodeId);
    if (node)
    {
        if (node.className.indexOf('hidden') != -1)
            node.className=node.className.replace('hidden', 'showed')
        else if (node.className.indexOf('showed') != -1)
            node.className=node.className.replace('showed', 'hidden')
        else node.className += ' showed';
     }
}