function clickclear(thisfield, defaulttext) {
	if (thisfield.value == defaulttext) {
		thisfield.value = "";
	}
}
function clickrecall(thisfield, defaulttext) {
	if (thisfield.value == "") {
		thisfield.value = defaulttext;
	}
}

	
			$(function() {
				var $ac_background	= $('#ac_background'),
				$ac_bgimage		= $ac_background.find('.ac_bgimage'),
				$ac_loading		= $ac_background.find('.ac_loading'),
				
				$ac_content		= $('#ac_content'),
				$title			= $ac_content.find('#logo'),
				$menu			= $ac_content.find('.ac_menu'),
				$mainNav		= $menu.find('ul#menu'),
				$menuItems		= $mainNav.children('li'),
				totalItems		= $menuItems.length,
				$ItemImages		= new Array();
				

				$menuItems.each(function(i) {
					$ItemImages.push($(this).children('a:first').attr('href'));
				});
				$ItemImages.push($ac_bgimage.attr('src'));
					  
				
				var Menu 			= (function(){
					var init				= function() {
						loadPage();
						initWindowEvent();
					},
					loadPage			= function() {

						$ac_loading.show();//show loading status image
						$.when(loadImages()).done(function(){
							$.when(showBGImage()).done(function(){
								//hide the loading status image
								$ac_loading.hide();
							});
						});
					},
					showBGImage			= function() {
						return $.Deferred(
						function(dfd) {
							//adjusts the dimensions of the image to fit the screen
							adjustImageSize($ac_bgimage);
							$ac_bgimage.fadeIn(1000, dfd.resolve);
						}
					).promise();
					},
											/* changes the background image */
					initWindowEvent		= function() {
						/* on window resize set the width for the menu */
						$(window).bind('resize.Menu' , function(e) {
							adjustImageSize($ac_bgimage);
							/* calculate new width for the menu */
							var new_w	= $(window).width() - $title.outerWidth(true);
							$menu.css('width', new_w + 'px');
						});
					},
						/* makes an image "fullscreen" and centered */
					adjustImageSize		= function($img) {
						var w_w	= $(window).width(),
						w_h	= $(window).height(),
						r_w	= w_h / w_w,
						i_w	= $img.width(),
						i_h	= $img.height(),
						r_i	= i_h / i_w,
						new_w,new_h,
						new_left,new_top;
							
						if(r_w > r_i){
							new_h	= w_h;
							new_w	= w_h / r_i;
						}
						else{
							new_h	= w_w * r_i;
							new_w	= w_w;
						}
							
						$img.css({
							width	: new_w + 'px',
							height	: new_h + 'px',
							left	: (w_w - new_w) / 2 + 'px',
							top		: (w_h - new_h) / 2 + 'px'
						});
					},
						/* preloads a set of images */
					loadImages			= function() {
						return $.Deferred(
						function(dfd) {
							var total_images 	= $ItemImages.length,
							loaded			= 0;
							for(var i = 0; i < total_images; ++i){
								$('<img/>').load(function() {
									++loaded;
									if(loaded === total_images)
										dfd.resolve();
								}).attr('src' , $ItemImages[i]);
							}
						}
					).promise();
					};
						
					return {
						init : init
					};
				})();
			
				/*
			call the init method of Menu
				 */
				Menu.init();
			});