function getElementsByClassName(searchClass, node, tag){
	var classElements = new Array();
	if (node == null)
	{
		node = document;
	}
	if (tag == null)
	{
		tag = '*';
	}
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)" + searchClass + "(\\s|$)");
	for (var i = 0, j = 0; i < elsLen; i++)
	{
		if (pattern.test(els[i].className))
		{
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}