document.getElementsByClassName = function(clsName,tag) {
	var retVal = new Array();
	if (tag == null) { tag="*"; }
	
	var elements = document.getElementsByTagName(tag);
	for(var i = 0;i < elements.length;i++){
		var classes = elements[i].className.split(" ");
		for(var j = 0;j < classes.length;j++){
			if(classes[j] == clsName) {
				retVal.push(elements[i]);
			}
		} // end for j
	} // end for i
	return retVal;
} // end function