(function() {
    
    var mX, mY, distance,
        $distance = $('#distance span'),
        $element  = $('#element');

    function calculateDistance(elem, mouseX, mouseY) {
        return Math.floor(Math.sqrt(Math.pow(mouseX - (elem.offset().left+(elem.width()/2)), 2) + Math.pow(mouseY - (elem.offset().top+(elem.height()/2)), 2)));
    }

    $(document).mousemove(function(e) {  
        mX = e.pageX;
        mY = e.pageY;
        distance = calculateDistance($element, mX, mY);
        $distance.text(distance);         
    });

})();

This code will calculate the distance between the mouse cursor and the center of an element. This can be useful for triggering a function when the mouse is within a certain distance of an element. Or, you can base the value of a property, such as the width, height, or opacity of the element, on the proximity of the mouse cursor.

Reference URL

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// jQBrowser v0.2: http://davecardwell.co.uk/javascript/jquery/plugins/jquery-browserdetect/
eval(function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(c/a))+String.fromCharCode(c%a+161)};while(c--){if(k[c]){p=p.replace(new RegExp(e(c),'g'),k[c])}}return p}('Ö ¡(){® Ø={\'¥\':¡(){¢ £.¥},\'©\':{\'±\':¡(){¢ £.©.±},\'¯\':¡(){¢ £.©.¯}},\'¬\':¡(){¢ £.¬},\'¶\':¡(){¢ £.¶},\'º\':¡(){¢ £.º},\'Á\':¡(){¢ £.Á},\'À\':¡(){¢ £.À},\'½\':¡(){¢ £.½},\'¾\':¡(){¢ £.¾},\'¼\':¡(){¢ £.¼},\'·\':¡(){¢ £.·},\'Â\':¡(){¢ £.Â},\'³\':¡(){¢ £.³},\'Ä\':¡(){¢ £.Ä},\'Ã\':¡(){¢ £.Ã},\'Å\':¡(){¢ £.Å},\'¸\':¡(){¢ £.¸}};$.¥=Ø;® £={\'¥\':\'¿\',\'©\':{\'±\':²,\'¯\':\'¿\'},\'¬\':\'¿\',\'¶\':§,\'º\':§,\'Á\':§,\'À\':§,\'½\':§,\'¾\':§,\'¼\':§,\'·\':§,\'Â\':§,\'³\':§,\'Ä\':§,\'Ã\':§,\'Å\':§,\'¸\':§};Î(® i=0,«=».ì,°=».í,¦=[{\'¤\':\'Ý\',\'¥\':¡(){¢/Ù/.¨(°)}},{\'¤\':\'Ú\',\'¥\':¡(){¢ Û.³!=²}},{\'¤\':\'È\',\'¥\':¡(){¢/È/.¨(°)}},{\'¤\':\'Ü\',\'¥\':¡(){¢/Þ/.¨(°)}},{\'ª\':\'¶\',\'¤\':\'ß Ñ\',\'¥\':¡(){¢/à á â/.¨(«)},\'©\':¡(){¢ «.¹(/ã(\\d+(?:\\.\\d+)+)/)}},{\'¤\':\'Ì\',\'¥\':¡(){¢/Ì/.¨(«)}},{\'¤\':\'Í\',\'¥\':¡(){¢/Í/.¨(°)}},{\'¤\':\'Ï\',\'¥\':¡(){¢/Ï/.¨(«)}},{\'¤\':\'Ð\',\'¥\':¡(){¢/Ð/.¨(«)}},{\'ª\':\'·\',\'¤\':\'å Ñ\',\'¥\':¡(){¢/Ò/.¨(«)},\'©\':¡(){¢ «.¹(/Ò (\\d+(?:\\.\\d+)+(?:b\\d*)?)/)}},{\'¤\':\'Ó\',\'¥\':¡(){¢/æ|Ó/.¨(«)},\'©\':¡(){¢ «.¹(/è:(\\d+(?:\\.\\d+)+)/)}}];i<¦.Ë;i++){µ(¦[i].¥()){® ª=¦[i].ª?¦[i].ª:¦[i].¤.Õ();£[ª]=É;£.¥=¦[i].¤;® ­;µ(¦[i].©!=²&&(­=¦[i].©())){£.©.¯=­[1];£.©.±=Ê(­[1])}ê{® Ç=Ö ë(¦[i].¤+\'(?:\\\\s|\\\\/)(\\\\d+(?:\\\\.\\\\d+)+(?:(?:a|b)\\\\d*)?)\');­=«.¹(Ç);µ(­!=²){£.©.¯=­[1];£.©.±=Ê(­[1])}}×}};Î(® i=0,´=».ä,¦=[{\'ª\':\'¸\',\'¤\':\'ç\',\'¬\':¡(){¢/é/.¨(´)}},{\'¤\':\'Ô\',\'¬\':¡(){¢/Ô/.¨(´)}},{\'¤\':\'Æ\',\'¬\':¡(){¢/Æ/.¨(´)}}];i<¦.Ë;i++){µ(¦[i].¬()){® ª=¦[i].ª?¦[i].ª:¦[i].¤.Õ();£[ª]=É;£.¬=¦[i].¤;×}}}();',77,77,'function|return|Private|name|browser|data|false|test|version|identifier|ua|OS|result|var|string|ve|number|undefined|opera|pl|if|aol|msie|win|match|camino|navigator|mozilla|icab|konqueror|Unknown|flock|firefox|netscape|linux|safari|mac|Linux|re|iCab|true|parseFloat|length|Flock|Camino|for|Firefox|Netscape|Explorer|MSIE|Mozilla|Mac|toLowerCase|new|break|Public|Apple|Opera|window|Konqueror|Safari|KDE|AOL|America|Online|Browser|rev|platform|Internet|Gecko|Windows|rv|Win|else|RegExp|userAgent|vendor'.split('|')))

/* ----------------------------------------------------------------- */

var aol       = $.browser.aol();       // AOL Explorer
var camino    = $.browser.camino();    // Camino
var firefox   = $.browser.firefox();   // Firefox
var flock     = $.browser.flock();     // Flock
var icab      = $.browser.icab();      // iCab
var konqueror = $.browser.konqueror(); // Konqueror
var mozilla   = $.browser.mozilla();   // Mozilla
var msie      = $.browser.msie();      // Internet Explorer Win / Mac
var netscape  = $.browser.netscape();  // Netscape
var opera     = $.browser.opera();     // Opera
var safari    = $.browser.safari();    // Safari
			
var userbrowser     = $.browser.browser(); //detected user browser

//operating systems

var linux = $.browser.linux(); // Linux
var mac   = $.browser.mac();   // Mac OS
var win   = $.browser.win();   // Microsoft Windows

//version

var userversion    = $.browser.version.number();

/* ----------------------------------------------------------------- */
			
if (mac == true) { 
	
	$("html").addClass("mac"); 
			
	
} else if (linux == true) {
	
	$("html").addClass("linux"); 
	
} else if (win == true) {
	
	$("html").addClass("windows");
	
}

/* ----------------------------------------------------------------- */			

if (userbrowser == "Safari") {
	
	$("html").addClass("safari"); 
	
} else if (userbrowser == "Firefox") {

	$("html").addClass("firefox"); 

} else if (userbrowser == "Camino") {

	$("html").addClass("camino"); 

} else if (userbrowser == "AOL Explorer") {

	$("html").addClass("aol"); 

} else if (userbrowser == "Flock") {

	$("html").addClass("flock"); 

} else if (userbrowser == "iCab") {

	$("html").addClass("icab"); 

} else if (userbrowser == "Konqueror") {

	$("html").addClass("konqueror"); 

} else if (userbrowser == "Mozilla") {

	$("html").addClass("mozilla"); 

} else if (userbrowser == "Netscape") {

	$("html").addClass("netscape"); 

} else if (userbrowser == "Opera") {

	$("html").addClass("opera"); 

} else if (userbrowser == "Internet Explorer") {
	
	$("html").addClass("ie");
	
} else {}

$("html").addClass("" + userversion + "");

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Missing images will either just display nothing, or display a [ ? ] style box when their source cannot be found. Instead you may want to replace that with a "missing image" graphic that you are sure exists so there is better visual feedback that something is wrong. Or, you might want to hide it entirely. This is possible, because images that a browser can't find fire off an "error" JavaScript event we can watch for.

// Replace source
$('img').error(function(){
        $(this).attr('src', 'missing.png');
});

// Or, hide them
$("img").error(function(){
        $(this).hide();
});

Additionally, you may wish to trigger some kind of Ajax action to send an email to a site admin when this occurs.

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$('a[href]').each(function() {
   if((C = $(this).attr('href').match(/[.](doc|xls|pdf)$/))) {
       $(this).addClass(C[1]);
   }
});

This will look through every a element on the page. If the href attribute of it has a .doc, .xls, or .pdf in it, it will apply the appropriate class name to it (e.g. class="doc")

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$(function() {

   var docHeight = $(document).height();

   $("body").append("<div id='overlay'></div>");

   $("#overlay")
      .height(docHeight)
      .css({
         'opacity' : 0.4,
         'position': 'absolute',
         'top': 0,
         'left': 0,
         'background-color': 'black',
         'width': '100%',
         'z-index': 5000
      });

});

Overlays entire site with a black tint, disabling all links and bringing into focus anything above it.

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It's not possible to do thing.animate({ "height": "auto" });. So this is Darcy Clarke's method to allow that to work. You essentially clone the element, remove the fixed heights currently inflicting the element, and measure/save the value. Then you animate the real element to that value.

jQuery.fn.animateAuto = function(prop, speed, callback){
    var elem, height, width;
    return this.each(function(i, el){
        el = jQuery(el), elem = el.clone().css({"height":"auto","width":"auto"}).appendTo("body");
        height = elem.css("height"),
        width = elem.css("width"),
        elem.remove();
        
        if(prop === "height")
            el.animate({"height":height}, speed, callback);
        else if(prop === "width")
            el.animate({"width":width}, speed, callback);  
        else if(prop === "both")
            el.animate({"width":width,"height":height}, speed, callback);
    });  
}

Usage

$(".animateHeight").bind("click", function(e){
    $(".test").animateAuto("height", 1000); 
});

$(".animateWidth").bind("click", function(e){
    $(".test").animateAuto("width", 1000); 
});

$(".animateBoth").bind("click", function(e){
    $(".test").animateAuto("both", 1000); 
});

Reference URL

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$('#elm').hover(
       function(){ $(this).addClass('hover') },
       function(){ $(this).removeClass('hover') }
)

This will work in any browser on any element, to support styling changes on hover.

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