function getObjectById(objectId) {
	if (document.getElementById && document.getElementById(objectId)) {
		return document.getElementById(objectId);
	} else if (document.all && document.all(objectId)) {
		return document.all(objectId);
	} else {
		return false;
	}
}

function getStyleObject(objectId) {
	if (getObjectById(objectId))
		return getObjectById(objectId).style;
	else
		return false;
}

function changeDiv(the_div, the_change) {
	if ((document.getElementById) || (document.all)) {
		var the_style = getStyleObject(the_div);
		if (the_style != false) {
			the_style.display = the_change;
		}
	}
}

function getElementsByClassName(classname, node) {
	if(!node) node = document.getElementsByTagName("body")[0];
	
	var a = [];
	var re = new RegExp('\\b' + classname + '\\b');
	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;
}