function getLocation() {
	loc = String(document.location);
	loc = loc.substr(loc.search(/\w+\.php/));
	if (loc.indexOf('_') != -1)
		loc = loc.substr(0, loc.indexOf('_'));
	else if (loc.indexOf('_') == -1)
		loc = loc.substr(0, loc.indexOf('.'));
	return loc;
}

function navDetect() {
	loc = getLocation();
	if (document.getElementById('nav_' + loc))
		document.getElementById('nav_' + loc).style.backgroundImage = 'url(img/menuItem_bg_over.jpg)';
	else if (document.getElementById('topNav_' + loc)) {
		document.getElementById('topNav_' + loc).style.textDecoration = 'underline';
	}
}

function togglePopup(obj, state, xOffset) {
	pos = findPos(document.getElementById('anchor'));
	//pos[0] = 600;
	//pos[1] = 50;
	if (state == 'show') {
		document.getElementById(obj).style.left = (pos[0] + 10 - xOffset) + 'px';
		document.getElementById(obj).style.top = pos[1] + 20 + 'px';
		//document.getElementById(obj).style.backgroundImage = 'url(img/menuItem_bg_over.jpg)';
		document.getElementById(obj).style.display = 'block';
	} else if (state == 'hide') {
		document.getElementById(obj).style.display = 'none';
		//changeTab('access');
	}
}

function findPos(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		do {
			curleft += obj.offsetLeft;
			curtop += obj.offsetTop;
		} while (obj = obj.offsetParent);
		return [curleft,curtop];
	}
}

function changeTab(which) {
	if (which == 'access') {
		document.getElementById('table_access').style.display = 'block';
		document.getElementById('table_forming').style.display = 'none';
		document.getElementById('table_shoring').style.display = 'none';
	} else if (which == 'forming') {
		document.getElementById('table_access').style.display = 'none';
		document.getElementById('table_forming').style.display = 'block';
		document.getElementById('table_shoring').style.display = 'none';
	} else if (which == 'shoring') {
		document.getElementById('table_access').style.display = 'none';
		document.getElementById('table_forming').style.display = 'none';
		document.getElementById('table_shoring').style.display = 'block';
	}
}

function swapImg(obj, i, state) {
	if (state == "over")
		obj.src = "img/" + i + "_over.jpg";
	else if (state == "off")
		obj.src = "img/" + i + ".jpg";
}