img.position.min.js

;(function($){'use strict';$.fn.imgPosition=function(options){var thisElement=$(this.selector);var defaults={width:thisElement.width(),height:thisElement.height(),};var setting=$.extend(defaults,options);var addEvent=function(elm,listener,fn){try{elm.addEventListener(listener,fn,false);}catch(e){elm.attachEvent("on"+listener,fn);}};addEvent(window,"load",function(){thisElement.css({'position':'relative','width':defaults.width,'height':defaults.height});thisElement.find("img").each(function(){var newImg=new Image();newImg.src=$(this).attr("src");var reference=resize(newImg);$(this).attr({"width":reference.width,"height":reference.height,}).css({"position":"absolute","top":"50%","left":"50%","margin-top":reference.marginTop,"margin-left":reference.marginLeft});});});var getNewSise=function(imgWidth,imgHeight,baseWidth,baseHeight){if(imgWidth<=defaults.width && imgHeight<=defaults.height ){return{success:true,width:imgWidth,height:imgHeight}}else{imgWidth -=10;imgHeight=imgWidth/baseWidth * baseHeight;return getNewSise(imgWidth,imgHeight,baseWidth,baseHeight);}};var resize=function(newImg){var imgWidth=newImg.naturalWidth;var imgHeight=newImg.naturalHeight;var baseWidth=imgWidth;var baseHeight=imgHeight;var result;if(defaults.width<baseWidth||defaults.height<baseHeight ){while(true){result=getNewSise(imgWidth,imgHeight,baseWidth,baseHeight);if(result.success ){break;}}return{width:result.width,height:result.height,marginTop:-(result.height/2),marginLeft:-(result.width/2),}}else{return{width:imgWidth,height:imgHeight,marginTop:-(imgHeight/2),marginLeft:-(imgWidth/2),};}};return(this);};})(jQuery);