var tags = new Array('contentBody');
var pixelArray =  new Array('10','12','16','20','24','30','40');
var emArray =  new Array('0.7','0.9','1.0','1.5','2.0','2.5','3');
var lineHeightArray =  new Array('12','14','18','22','26','34','44');
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;
    var contentDiv = document.getElementById("content");
    for (var i = 0 ; i < tags.length; i++) {
        getallTags = getElementsByClass("contentBody", contentDiv, null);
    }
    for (var i = 0 ; i < getallTags.length ; i++) { 
        getallTags[i].style.fontSize = (unit=="px") ? pixelArray[size]+unit: emArray[size]+unit;
        getallTags[i].style.lineHeight = lineHeightArray[size]+unit;
    }
}