jQuery dock plugin

jQueryDock

function distance(x0, y0, x1, y1) {
				var xDiff = x1-x0;
				var yDiff = y1-y0;
				
				return Math.sqrt(xDiff*xDiff + yDiff*yDiff);
			}

asdasdasd			$(document).ready(function() {
				var proximity = 180;
				var iconSmall = 48, iconLarge = 128; //css also needs changing to compensate with size
				var iconDiff = (iconLarge - iconSmall);
				var mouseX, mouseY;
				var dock = $("#dock");
				var animating = false, redrawReady = false;
				
				$(document.body).removeClass("no_js");
				
				//below are methods for maintaining a constant 60fps redraw for the dock without flushing
				$(document).bind("mousemove", function(e) {
					if (dock.is(":visible")) {
						mouseX = e.pageX;
						mouseY = e.pageY;
					
						redrawReady = true;
						registerConstantCheck();
					}
				});
				
				function registerConstantCheck() {
					if (!animating) {
						animating = true;
						
						window.setTimeout(callCheck, 15);
					}
				}
				
				function callCheck() {
					sizeDockIcons();
					
					animating = false;
				
					if (redrawReady) {
						redrawReady = false;
						registerConstantCheck();
					}
				}
				
				//do the maths and resize each icon
				function sizeDockIcons() {
					dock.find("li").each(function() {
						//find the distance from the center of each icon
						var centerX = $(this).offset().left + ($(this).outerWidth()/2.0);
						var centerY = $(this).offset().top + ($(this).outerHeight()/2.0);
						
						var dist = distance(centerX, centerY, mouseX, mouseY);
						
						//determine the new sizes of the icons from the mouse distance from their centres
						var newSize =  (1 - Math.min(1, Math.max(0, dist/proximity))) * iconDiff + iconSmall;
						$(this).find("a").css({width: newSize});
					});
				}
			});