var min=8;
var max=18;

document.getElementsByClassName = function(cl) {
	var retnode = [];
	var myclass = new RegExp('\\b'+cl+'\\b');
	var elem = this.getElementsByTagName('*');
	for (var i = 0; i < elem.length; i++) {
		var classes = elem[i].className;
		if (myclass.test(classes)) retnode.push(elem[i]);
	}
	return retnode;
};

function increaseFontSize() {
	var p = document.getElementsByClassName('right');
	for(i=0;i<p.length;i++) {
		if(p[i].style.fontSize) {
			var s = parseInt(p[i].style.fontSize.replace("px",""));
		} else {
			var s = 12;
		}
		if(s!=max) {
			s += 1;
		}
		p[i].style.fontSize = s+"px"
	}
}
function decreaseFontSize() {
	var p = document.getElementsByClassName('right');
	for(i=0;i<p.length;i++) {
		if(p[i].style.fontSize) {
			var s = parseInt(p[i].style.fontSize.replace("px",""));
		} else {
			var s = 12;
		}
		if(s!=min) {
			s -= 1;
		}
		p[i].style.fontSize = s+"px"
	}   
}