document.getElementsByClassName = function (el) {

	var searchObj, nodeList;

	// initialize
	searchObj = n = new Object();
	for (var i = 1; i < arguments.length; i++) {
		searchObj[arguments[i]] = new Array();
	}

	nodeList = el.all || el.getElementsByTagName("*");

	// loop over all descendant elements (c)
	for (var i = 0, c = null, cn; (el.all ? c = nodeList(i) : c = nodeList.item(i)); i++) {
		if (c.nodeType == 1) {
			cn = c.className.split(" ");
			for (j = 0; j < cn.length; j++) {

				// if the current cn element is defined in searchObj, 
				// then it must be one we're searching for. add it.
				if (searchObj[cn[j]]) {
					searchObj[cn[j]][searchObj[cn[j]].length] = c;
				}
			}
		}
	}

	return searchObj;
}

Array.prototype.push = function ( e ) {

	this[this.length]=e;

}