/*!
* jQuery miniZoomPan 1.0
* 2009 Gian Carlo Mingati
* Version: 1.0 (18-JUNE-2009)
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
* Requires:
* jQuery v1.3.2 or later
* 
*/

jQuery.fn.miniZoomPan = function(settings) {
	
	settings = jQuery.extend({
		sW: 10, // small image width
		sH: 10, // small image height
		lW: 20, // large image width
		lH: 20, // large image height
		frameColor: "#cecece",
		frameWidth: 1,
		loaderContent: "loading..." // plain text or an image tag eg.: "<img src='yoursite.com/spinner.gif' />"
	}, settings);

	return this.each(function(){
		
		var div =  jQuery(this);
		div.css({width: settings.sW, height: settings.sH, border: settings.frameWidth+"px solid "+settings.frameColor}).addClass("minizoompan");
		
		var ig = div.children();
		ig.css({position: "relative"});
		
		jQuery(window).bind("load", function() {
			ig.width(settings.sW); 
			ig.height(settings.sH); 
		});
		
		div.css({overflow: "hidden"});
		
		jQuery("<span class='loader'>"+settings.loaderContent+"<\/span>").insertBefore(ig);
				
		div.mousemove(function(e){
			var divWidth = div.width();
			var divHeight = div.height();
			var igW = ig.width();
			var igH = ig.height();
			var dOs = div.offset();
			var leftPan = (e.pageX - dOs.left) * (divWidth - igW) / (divWidth+settings.frameWidth*2);
			var topPan = (e.pageY - dOs.top) * (divHeight - igH) / (divHeight+settings.frameWidth*2);
			ig.css({left: leftPan, top: topPan});			
		});    
		
		div.hover(
			function () {
				ig.css({ width: settings.lW, height: settings.lH});
				var hiSrc = ig.attr("src").replace(/\/medium\//, '/full/');
				swapImage(ig, hiSrc);
				div.children("span.loader").fadeIn(250);
			},
			function () {
				ig.css({left: "0", top: "0", width: settings.sW, height: settings.sH});
				var loSrc = ig.attr("src").replace(/\/full\//, '/medium/');
				swapImage(ig, loSrc);
				div.children("span.loader").fadeOut(250);
			}
		);
		
		function swapImage(param, uri){
			param.load(function () {
				div.children("span.loader").fadeOut(250);
			}).error(function (){
			alert("Image does not exist or its SRC is not correct.");
			}).attr('src', uri);
		}
		

		
	});	

};