function switchimage(newimg, oldimg) {
	var img = document.getElementById(oldimg);
	img.setAttribute('src', 'assets/images/' + newimg);
}

function openLevel(el)
{
	if(!el) return false;
	
	/* First parent */
	p1	= el.parentNode;
	subHeader = p1.getElementsByTagName('p')[1];
	if(!(d1	= p1.getElementsByTagName('div')[0])) return false;
	
	if(subHeader.className == 'subjecthdropen') { 
		subHeader.className = 'subjecthdrclose';
		d1.style.display = 'none'; 
	} else {
		subHeader.className = 'subjecthdropen';
		d1.style.display = 'block';
	}
		
	//alert(p1.getElementsByTagName('div')[0].className);
}

function expandSub(el, divname)
{
	divEl = document.getElementById('sub_' + divname);
	
	if(divEl.style.display == 'block') { 
		divEl.style.display = 'none'; 
		el.parentNode.getElementsByTagName('span')[0].innerHTML = '+';
	} else {
		divEl.style.display = 'block'; 
		el.parentNode.getElementsByTagName('span')[0].innerHTML = '-';
	}
}

var min=12;
var max=16;
function increaseFontSize(divname) {
	var p = document.getElementById(divname);

	if(p.style.fontSize) {
		var s = parseInt(p.style.fontSize.replace("px",""));
	} else {
		var s = 12;
	}
	if(s!=max) {
		s += 1;
	}
	p.style.fontSize = s+"px"

}
function decreaseFontSize(divname) {
	var p = document.getElementById(divname);
	if(p.style.fontSize) {
		var s = parseInt(p.style.fontSize.replace("px",""));
	} else {
		var s = 12;
	}
	if(s!=min) {
		s -= 1;
	}
	p.style.fontSize = s+"px"

}