// JavaScript Document
var tags = new Array ('p','a','h2','ul','h3','li','h1');
var pixelArray = new Array('9','10','12','14','18','21');
var emArray = new Array('0.7','0.9','1.0','1.5','2.0','2.5'); 

var initSize = 2; 

 function fontSizer(inc,unit) {
 if (!document.getElementById)
 return;
 var size = initSize;
 size += inc;
 if (size < 0 ) {
 size = 0;
}
 if (size > 5 ) {
 size = 5;
 }
 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;
 }
}