JavaScript - Dim Light Follow Mouse

$(function () {
  $('.bubbleInfo').each(function () {
    // options
    var distance = 0;
    var time = 250;
    var hideDelay = 30;

    var hideDelayTimer = null;

    // tracker
    var beingShown = false;
    var shown = false;
    
    var trigger = $('.trigger', this);
    var popup = $('.popup', this).css('opacity', 0);

    // set the mouseover and mouseout on both element
    $([trigger.get(0), popup.get(0)]).mouseover(function () {
      // stops the hide event if we move from the trigger to the popup element
      if (hideDelayTimer) clearTimeout(hideDelayTimer);

      // don't trigger the animation again if we're being shown, or already visible
      if (beingShown || shown) {
        return;
      } else {
        beingShown = true;

        // reset position of popup box
        popup.css({
          top: 10,
          left: 50,
          display: 'block' // brings the popup back in to view
        })

        // (we're using chaining on the popup) now animate it's opacity and position
        .animate({
          top: '-=' + distance + 'px',
          opacity: 1
        }, time, 'swing', function() {
          // once the animation is complete, set the tracker variables
          beingShown = false;
          shown = true;
        });
      }
    }).mouseout(function () {
      // reset the timer if we get fired again - avoids double animations
      if (hideDelayTimer) clearTimeout(hideDelayTimer);
      
      // store the timer so that it can be cleared in the mouseover if required
      hideDelayTimer = setTimeout(function () {
        hideDelayTimer = null;
        popup.animate({
          top: '-=' + distance + 'px',
          opacity: 0
        }, time, 'swing', function () {
          // once the animate is complete, set the tracker variables
          shown = false;
          // hide the popup entirely after the effect (opacity alone doesn't do the job)
          popup.css('display', 'none');
        });
      }, hideDelay);
    });
  });
});

<SCRIPT language="javascript" type="text/javascript">
if (document.images)
{
/* preload images */
	var subcontractorsOn = new Image ();
	subcontractorsOn.scr = "subcontractorsOn.gif";
	
 	var subcontractorsOff = new Image ();
	subcontractorsOff.scr = "subcontractorsOff.gif";
}
	function mouseOn (imgName)
	{
		if (document.images)
			document [imgName].scr = eval (imgName + "On.scr");
	}
	
	function mouseOff (imgName)
	{
		if (document.images)
			document [imgName].scr = eval (imgName + "Off.scr");
	}
	
</SCRIPT>

<a href="subcontractors.htm" onMouseOut="mouseOn('subcontractors')"
onMouseOver="mouseOff('subcontractors')">
<img src="subcontractorsOff.gif" height="40" width="133" name="subcontractors" id="subcontractors" border="0" alt="subcontractors"></a>

<div id="contact-form">
       <a class="contact" href="#">Demo</a></div>

$(document).ready(function () {
	$('#contact-form input.contact, #contact-form a.contact').click(function (e) {
		e.preventDefault();
		// load the contact form using ajax
		$.get("data/contact.php", function(data){
			// create a modal dialog with the data
			$(data).modal({
				closeHTML: "<a href='#' title='Close' class='modal-close'>x</a>",
				position: ["15%",],
				overlayId: 'contact-overlay',
				containerId: 'contact-container',
				onOpen: contact.open,
				onShow: contact.show,
				onClose: contact.close
			});
		});
	});

	// preload images
	var img = ['cancel.png', 'form_bottom.gif', 'form_top.gif', 'loading.gif', 'send.png'];
	$(img).each(function () {
		var i = new Image();
		i.src = 'img/contact/' + this;
	});
});

var contact = {
	message: null,
	open: function (dialog) {
		// add padding to the buttons in firefox/mozilla
		if ($.browser.mozilla) {
			$('#contact-container .contact-button').css({
				'padding-bottom': '2px'
			});
		}
		// input field font size
		if ($.browser.safari) {
			$('#contact-container .contact-input').css({
				'font-size': '.9em'
			});
		}

		// dynamically determine height
		var h = 280;
		if ($('#contact-subject').length) {
			h += 26;
		}
		if ($('#contact-cc').length) {
			h += 22;
		}

		var title = $('#contact-container .contact-title').html();
		$('#contact-container .contact-title').html('Loading...');
		dialog.overlay.fadeIn(200, function () {
			dialog.container.fadeIn(200, function () {
				dialog.data.fadeIn(200, function () {
					$('#contact-container .contact-content').animate({
						height: h
					}, function () {
						$('#contact-container .contact-title').html(title);
						$('#contact-container form').fadeIn(200, function () {
							$('#contact-container #contact-name').focus();

							$('#contact-container .contact-cc').click(function () {
								var cc = $('#contact-container #contact-cc');
								cc.is(':checked') ? cc.attr('checked', '') : cc.attr('checked', 'checked');
							});

							// fix png's for IE 6
							if ($.browser.msie && $.browser.version < 7) {
								$('#contact-container .contact-button').each(function () {
									if ($(this).css('backgroundImage').match(/^url[("']+(.*\.png)[)"']+$/i)) {
										var src = RegExp.$1;
										$(this).css({
											backgroundImage: 'none',
											filter: 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src="' +  src + '", sizingMethod="crop")'
										});
									}
								});
							}
						});
					});
				});
			});
		});
	},
	show: function (dialog) {
		$('#contact-container .contact-send').click(function (e) {
			e.preventDefault();
			// validate form
			if (contact.validate()) {
				var msg = $('#contact-container .contact-message');
				msg.fadeOut(function () {
					msg.removeClass('contact-error').empty();
				});
				$('#contact-container .contact-title').html('Sending...');
				$('#contact-container form').fadeOut(200);
				$('#contact-container .contact-content').animate({
					height: '80px'
				}, function () {
					$('#contact-container .contact-loading').fadeIn(200, function () {
						$.ajax({
							url: 'data/contact.php',
							data: $('#contact-container form').serialize() + '&action=send',
							type: 'post',
							cache: false,
							dataType: 'html',
							success: function (data) {
								$('#contact-container .contact-loading').fadeOut(200, function () {
									$('#contact-container .contact-title').html('Thank you!');
									msg.html(data).fadeIn(200);
								});
							},
							error: contact.error
						});
					});
				});
			}
			else {
				if ($('#contact-container .contact-message:visible').length > 0) {
					var msg = $('#contact-container .contact-message div');
					msg.fadeOut(200, function () {
						msg.empty();
						contact.showError();
						msg.fadeIn(200);
					});
				}
				else {
					$('#contact-container .contact-message').animate({
						height: '30px'
					}, contact.showError);
				}
				
			}
		});
	},
	close: function (dialog) {
		$('#contact-container .contact-message').fadeOut();
		$('#contact-container .contact-title').html('Goodbye...');
		$('#contact-container form').fadeOut(200);
		$('#contact-container .contact-content').animate({
			height: 40
		}, function () {
			dialog.data.fadeOut(200, function () {
				dialog.container.fadeOut(200, function () {
					dialog.overlay.fadeOut(200, function () {
						$.modal.close();
					});
				});
			});
		});
	},
	error: function (xhr) {
		alert(xhr.statusText);
	},
	validate: function () {
		contact.message = '';
		if (!$('#contact-container #contact-name').val()) {
			contact.message += 'Name is required. ';
		}

		var email = $('#contact-container #contact-email').val();
		if (!email) {
			contact.message += 'Email is required. ';
		}
		else {
			if (!contact.validateEmail(email)) {
				contact.message += 'Email is invalid. ';
			}
		}

		if (!$('#contact-container #contact-message').val()) {
			contact.message += 'Message is required.';
		}

		if (contact.message.length > 0) {
			return false;
		}
		else {
			return true;
		}
	},
	validateEmail: function (email) {
		var at = email.lastIndexOf("@");

		// Make sure the at (@) sybmol exists and  
		// it is not the first or last character
		if (at < 1 || (at + 1) === email.length)
			return false;

		// Make sure there aren't multiple periods together
		if (/(\.{2,})/.test(email))
			return false;

		// Break up the local and domain portions
		var local = email.substring(0, at);
		var domain = email.substring(at + 1);

		// Check lengths
		if (local.length < 1 || local.length > 64 || domain.length < 4 || domain.length > 255)
			return false;

		// Make sure local and domain don't start with or end with a period
		if (/(^\.|\.$)/.test(local) || /(^\.|\.$)/.test(domain))
			return false;

		// Check for quoted-string addresses
		// Since almost anything is allowed in a quoted-string address,
		// we're just going to let them go through
		if (!/^"(.+)"$/.test(local)) {
			// It's a dot-string address...check for valid characters
			if (!/^[-a-zA-Z0-9!#$%*\/?|^{}`~&'+=_\.]*$/.test(local))
				return false;
		}

		// Make sure domain contains only valid characters and at least one period
		if (!/^[-a-zA-Z0-9\.]*$/.test(domain) || domain.indexOf(".") === -1)
			return false;	

		return true;
	},
	showError: function () {
		$('#contact-container .contact-message')
			.html($('<div class="contact-error"></div>').append(contact.message))
			.fadeIn(200);
	}
};