Array.prototype.f_contains = function(s) {
	for (var i = 0; i < this.length; i++) {
		if (this[i] == s) return true;
	}
	return false;
}

addEvent(window, 'load', replace);

function replace() {
	// open links to downloadable files or other sites in a new window

	// known extensions for downloadable files
	var exts = ['png', 'jpg', 'jpeg', 'gif', 'pdf', 'doc', 'xls', 'ppt', 'zip', 'gz', 'mpg', 'mpeg', 'mov', 'mp4', 'avi', 'wmv', 'mp3', 'wav', 'swf', 'gif', 'jpg', 'jpeg', 'png', 'bmp', 'tif', 'tiff', 'svg'];

	var links = document.getElementsByTagName('a');

	for (var i = 0; i < links.length; i++) {

		var link  = links[i];

		// find extension
		var split_slash = link.href.split('/');
		var split_ext   = split_slash[split_slash.length - 1].split('.');
		var ext = split_ext[split_ext.length - 1];

		// check if extension indicates a downloadable file
		if (split_ext.length > 1) {
			if (exts.f_contains(ext)) {
				links[i].target = '_blank';
			}
		}

		// look for links to other sites
		if (link.href.substring(0, 7) == 'http://') {
			if (link.href.substring(7, 7 + window.location.hostname.length) != window.location.hostname) {
				links[i].target = '_blank';
			}
		}
	}
}

// prototype library extension defined in domready.js
Event.onDOMReady(function() {
	enhance_menu('mainmenu');
	enhance_menu('generalmenu');
});

function enhance_menu(menu_id) {
	// find the first link in each menu li
	var menu_links = $$('div#' + menu_id + ' li a:first');

	for (var i = 0; i < menu_links.length; i++) {
		var menu_link = menu_links[i];

		if (menu_link.up().hasClassName('current')) {
			menu_link.addClassName('on');
		} else {
			addEvent(menu_link, 'mouseover', function() {
				if (!this.hasClassName('on')) {
					this.addClassName('on');
				}
			});
			addEvent(menu_link, 'mouseout', function() {
				if (this.hasClassName('on')) {
					this.removeClassName('on');
				}
			});
		}
	}
}