function _communiacs_show(element){
	element.className += " hover";
}

function _communiacs_hide(element){
	if(element.className == 'hover')
		element.className = '';
	else {
		element.className = element.className.replace(/ hover/g, "");
	}
}

function _communiacs_getElementsByTagAndClass(p_source, p_tag, p_class) {
	var t_return = new Array();
	var t_elements = p_source.getElementsByTagName(p_tag);
	for(var i = 0; i < t_elements.length; i++) {
		if(t_elements[i].className.indexOf(p_class) > -1) {
			t_return[t_return.length] = t_elements[i];
		}
	}
	return t_return;
}

function openPreviousLink(elem) {
	elem.parentNode.parentNode.getElementsByTagName('a')[0].onclick();
}

function communiacs_resize_content_columns() {
	var t_content_height = document.getElementById('content_wrapper').offsetHeight;
	var t_navi_height = document.getElementById('lvl2_menu').offsetHeight;
	if(t_content_height > t_navi_height)
		t_base_height = t_content_height;
	else
		t_base_height = t_navi_height;
	document.getElementById('border_left').style.height = t_base_height + 'px';
	document.getElementById('lvl2_menu').style.height = t_base_height + 'px';
	document.getElementById('content_wrapper').style.height = t_base_height + 'px';
	document.getElementById('border_right').style.height = t_base_height + 'px';
}