var min=10;
var max=18;
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"

}
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
try {
var pageTracker = _gat._getTracker("UA-10661491-5");
pageTracker._trackPageview();
} catch(err) {}</script>