var tags = new Array('p','li','h1','h2','a');
var pixelArray = new Array('11','14','18','24');
var emArray = new Array('0.9','1.2','1.6');
var initSize = 0;
function fontSizer(inc,unit) {
	if (!document.getElementById) return;
	var size = initSize;
	size += inc;
	if (size < 0 ) {
		size = 0;
	}
	if (size > 3 ) {
		size = 3;
	}
	initSize = size;
	getBody = document.getElementsByTagName('body')[0];
	for (i = 0 ; i < tags.length ; i++ ) {
		getallTags = getBody.getElementsByTagName(tags[i]);
	for (k = 0 ; k < getallTags.length ; k++)
		getallTags[k].style.fontSize = (unit=='px') ? pixelArray[size]+unit: emArray[size]+unit;
	}
}