So I'm trying to hack together a simple javascript that counts the number of named classes and writes that number back into the page. This is what i have so far. Am I close? Doesn't appear to work for me.

function getElementsByClass(node,searchClass,tag) {
var classElements = new Array();
var els = node.getElementsByTagName(tag); // use "*" for all elements
var elsLen = els.length;
var pattern = new RegExp("\\b"+searchClass+"\\b");
for (i = 0, j = 0; i < elsLen; i++) {
if ( pattern.test(els[i].className) ) {
classElements[j] = els[i];
j++;
}
}
return classElements;
}
function sectionNumber() {
var sectionNum = getElementsByClass(document,'fooClassName','*');
document.getElementById('classTotals').innerhtml= sectionNum;
}

and in the html i have a div named "classTotals"