userAgent = window.navigator.userAgent;
browserVers = parseInt(userAgent.charAt(userAgent.indexOf("/")+1),10);
mustInitImg = true;

function preloadImages() {
	if (document.images) {
		pre_on_about_10 = newImage('images/on_about_10.jpg');
		pre_on_test_11 = newImage('images/on_test_11.jpg');
		pre_on_form_12 = newImage('images/on_form_12.jpg');
		pre_on_faq_13 = newImage('images/on_faq_13.jpg');
		pre_on_meet_14 = newImage('images/on_meet_14.jpg');
		pre_on_contact_15 = newImage('images/on_contact_15.jpg');
		pre_on_links_16 = newImage('images/on_links_16.jpg');
		preloadFlag = true;
	}
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImagesArray(array) {
	if (preloadFlag == true) {
		var d = document; var img;
		for (i=0;i<array.length;i+=2) {
			img = null; var n = array[i];
			if (d.images) {
				if (d.layers) {img = findElement(n,0);}
				else {img = d.images[n];}
			}
			if (!img && d.getElementById) {img = d.getElementById(n);}
			if (!img && d.getElementsByName) {
				var elms = d.getElementsByName(n);
				if (elms) {
					for (j=0;j<elms.length;j++) {
						if (elms[j].src) {img = elms[j]; break;}
					}
				}
			}
			if (img) {img.src = array[i+1];}
		}
	}
}

function changeImages() {
	changeImagesArray(changeImages.arguments);
}

function findElement(n,ly) {
	var d = document;
	if (browserVers < 4)		return d[n];
	if ((browserVers >= 6) && (d.getElementById)) {initImgID; return(d.getElementById(n))}; 
	var cd = ly ? ly.document : d;
	var elem = cd[n];
	if (!elem) {
		for (var i=0;i<cd.layers.length;i++) {
			elem = findElement(n,cd.layers[i]);
			if (elem) return elem;
		}
	}
	return elem;
}


function update_test_score(ele) {
	var clr = ele.value == 0 ? '#ff0000' : '#009900';
	
	var sibs = ele.siblings();
	for(i=0; i<sibs.size(); i++) {
	  if(sibs[i].tagName == 'SPAN') { sibs[i].style.color = ''; }
	}
	
	ele.next().style.color = clr;
	
	inputs = document.getElementsByTagName('input');
	
	var total = 0;
	
	for(i=0; i<inputs.length; i++) {
	  if(inputs[i].checked) { total += parseInt(inputs[i].value); }
	}
	
	$('total_score').innerHTML = total;
}