little jQuery snippets that I use on most sites.

custom.js

$(document).ready(function () {


	$('a.new-window, a[rel=external]').live("click", function(){
		window.open(this.href);
		return false;
	});

	jQuery.fn.center = function (onTopOf) {
		this.css("position","absolute");
		if (onTopOf == null) {
		    this.css("top", ( $(window).height() - this.height() ) / 2+$(window).scrollTop() + "px");
		    this.css("left", ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + "px");
		} else {
		    var pos = $(onTopOf).position();
		    this.css("top", pos.top +  ( $(onTopOf).height() - this.height() ) / 2+  "px");
		    this.css("left", pos.left + ( $(onTopOf).width() - this.width() ) / 2+ "px");
		}
		return this;
	}


        $("li:last-child").addClass("last-child");
        $("li:first-child").addClass("first-child");

	$("input[type=text]").addClass("text");
	$("input[type=password]").addClass("text");
	$("input[type=submit]").addClass("submit");

        $("img[align='right']","#content").addClass("align-right");
        $("img[align='left']","#content").addClass("align-left");
        $("img[align='center']","#content").addClass("align-center");
        $("img").removeAttr("vspace");
        $("img").removeAttr("hspace");

	swapValues = [];
	$(".swapValue").addClass("swapDefault");
	$(".swapValue").each(function(i){
		swapValues[i] = $(this).val();
		$(this).focus(function(){
		    if ($(this).val() == swapValues[i]) {
			$(this).val("");
			$(this).removeClass("swapDefault");
		    }
		}).blur(function(){
		    if ($.trim($(this).val()) == "") {
			$(this).val(swapValues[i]);
			$(this).addClass("swapDefault");
		    }
		});
	});

        if($.browser.msie){
		$("#topNav li").hover(
		function () {
		    $(this).addClass('sfhover');
		}, 
		function () {
		    $(this).removeClass('sfhover');
		}
		);
        }
});