function hideDivs(curdiv, tag) {
	var countel = document.getElementsByClassName(tag).length;
	var i = 0;
	while (i < countel) {
		var el = document.getElementById(tag+i);
		if (null !== el) {
			if (i == curdiv) el.style.display='block';
			else el.style.display='none';
		}
		i++
	}
	return false;
}

document.getElementsByClassName = function(cl) {
	var retnode = [];
	var myclass = new RegExp('\\b'+cl+'\\b');
	var elem = this.getElementsByTagName('*');
	for (var i = 0; i < elem.length; i++) {
		var classes = elem[i].className;
		if (myclass.test(classes)) retnode.push(elem[i]);
	}
	return retnode;
};