/*----------------------------------------------------------------------------
Apache JavaScript Functions

Author:   David Foster
Email:    david@apache.co.uk

Details:  Contains oft-required, project-nonspecific JavaScript functions.
          See I:\Apache\Code\JavaScript\Functions for full documentation.
----------------------------------------------------------------------------*/

function $(id) {
	return document.getElementById(id);
}

function addClass(el, className) {
	if (!hasClass(el, className)) el.className += ' ' + className;
}

function addLoadEvent(func) {
	var oldOnload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	}
	else {
		window.onload = function() {
			if (oldOnload) {
				oldOnload();
			}
			func();
		};
	}
}

function hasClass(el, className) {
	var regex = new RegExp('(^|\\s)' + className + '(\\s|$)');
	return regex.test(el.className);
}

function removeClass(el, className) {
	var regex = new RegExp('(^|\\s)' + className + '(\\s|$)');
	el.className = el.className.replace(regex, ' ');
}