Get html elements by class name.

getElementsByClassName.js

/*
There are many scripts out there for this but 
many of them use a regular expression with \b. 
The problem with this is \b matches more then 
white space, like '-'. So if you want to find 
all elements with the class 'expando' elements 
with 'expando-button' will be returned. 
This function fixes this problem.
*/

function getElementsByClassName(node, classname){
    var a = [];
    var re = new RegExp(' ' + classname + ' ');
    var els = node.getElementsByTagName('*');
    for(var i=0,j=els.length; i<j; i++){
        if(re.test(' '+els[i].className+' ')){
            a.push(els[i]);
        }
    }
    return a;
}