var tags = new Array('div','td','tr','p','b','span','table','strong','emphasis','a','h1', 
'h2','h3','pre','sub','sup','i','th','cp','ul','ol','li','dt','dd');

var pixelArray = new Array('10','12','14','18','24','30','40');
var emArray = new Array('0.7','0.9','1.0','1.5','2.0','2.5','3'); 

var initSize = 1; 

function fontSizer(inc,unit) {

   if (!document.getElementById) return;

      var size = initSize;
	size += inc;
	if (size < 0 ) {
	   size = 0;
	}
	if (size > 6 ) {
	   size = 6;
	}
	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;
	}

}