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

function addResizeEvent(func) {
  var oldonresize = window.onresize;
  if (typeof window.onresize != 'function') {
    window.onresize = func;
  } else {
    window.onresize = function() {
      oldonresize();
      func();
    }
  }
}

function popup(url, windowname, width, height) {
	var windowname = windowname;
	var width = width;
	var height = height;
	var left = (screen.width  - width) / 2;
	var top = (screen.height - height) / 2;
	var params = 'width=' + width + ', height=' + height;
		params += ', top=' + top + ', left=' + left;
		params += ', directories=no';
		params += ', location=no';
		params += ', menubar=no';
		params += ', resizable=no';
		params += ', scrollbars=no';
		params += ', status=no';
		params += ', toolbar=no';

	newwin = window.open(url, windowname, params);

	if (window.focus) {
		newwin.focus()
	}
	return false;
}

(function($) {
	/**
	 * equalizes the heights of all elements in a jQuery collection
	 * thanks to John Resig for optimizing this!
	 * usage: $("#col1, #col2, #col3").equalizeCols();
	 */

	$.fn.equalizeCols = function(){
		var height = 0,
			reset = $.browser.msie && $.browser.version < 7 ? "1%" : "auto";

		return this
			.css("height", reset)
			.each(function() {
				height = Math.max(height, this.offsetHeight);
			})
			.css("height", height)
			.each(function() {
				var h = this.offsetHeight;
				if (h > height) {
					$(this).css("height", height - (h - height) );
				};
			});

	};

})(jQuery);