I am editing a website created by somebody else and I'm currently working on the image gallery. The problem I have is that when clicking on the image thumbnail, the image opens larger than its real size and thus appears blurred. So the images are 760x509 and they open up in 1015x768.

This is the website, you can take a peek at the problem here: http://www.vilaiuliana.ro/exterioren.html

On clicking the thumbnails, all images open in an in-built gallery configured in a JavaScript file, pirobox.js. I tried to use HTML and set the height and width, but the images open in separate windows if I don't use the .js file, so that's no solution.

The HTML code for each image is:

<div class="gal"><a href="images/ext big5.jpg" class="pirobox_gall" title="1st Project Image"><img src="images/ext5. jpg" alt="" title="" class="gal_img" ?.</a></div>

All the code for the image gallery is in pirobox.js

And now here is the JavaScript code......

Hope I am not giving you headaches, I really don't know what part of the script should be modified to display images in their real size. Any kind of help is hugely appreciated, I am totally lost here. Thank you in advance!

Code:
/**
* Name: piroBox v.1.2.2
* Date: May 2010
* Autor: Diego Valobra (http://www.pirolab.it),(http://www.diegovalobra.com)
* Version: 1.2.2
* Licence: CC-BY-SA http://creativecommons.org/licenses/by-sa/2.5/it/
**/

(function($) {
	$.fn.piroBox = function(opt) {
		opt = jQuery.extend({
		my_speed : null,
		close_speed : 300,
		bg_alpha : 0.5,
		close_all : '.piro_close,.piro_overlay',
		slideShow : null,
		slideSpeed : null
		}, opt);

		function start_pirobox() {
		  var corners = 
			  '<tr>'+					   
			  '<td colspan="3" class="pirobox_up"></td>'+
			  '</tr>'+	
			  '<tr>'+	
			  '<td class="t_l"></td>'+
			  '<td class="t_c"></td>'+
			  '<td class="t_r"></td>'+
			  '</tr>'+
			  '<tr>'+
			  '<td class="c_l"></td>'+
			  '<td class="c_c"><span><span></span></span><div></div></td>'+
			  '<td class="c_r"></td>'+
			  '</tr>'+
			  '<tr>'+
			  '<td class="b_l"></td>'+
			  '<td class="b_c"></td>'+
			  '<td class="b_r"></td>'+
			  '</tr>'+
			  '<tr>'+
			  '<td colspan="3" class="pirobox_down"></td>'+
			  '</tr>';
			var window_height =  $(document).height();
			var bg_overlay = $(jQuery('<div class="piro_overlay"></div>').hide().css({'opacity':+opt.bg_alpha,'height':window_height+'px'}));
			var main_cont = $(jQuery('<table class="pirobox_content" cellpadding="0" cellspacing="0"></table>'));
			var caption = $(jQuery('<div class="caption"></div>'));
			var piro_nav = $(jQuery('<div class="piro_nav"></div>'));
			var piro_close = $(jQuery('<a href="#close" class="piro_close" title="close"></a>'));
			var piro_play = $(jQuery('<a href="#play" class="play" title="play slideshow"></a>'));
			var piro_stop = $(jQuery('<a href="#stop" class="stop" title="stop slideshow"></a>'));
			var piro_prev = $(jQuery('<a href="#prev" class="piro_prev" title="previous image"></a>'));
			var piro_next = $(jQuery('<a href="#next" class="piro_next" title="next image"></a>'));				
			$('body').append(bg_overlay).append(main_cont);
			main_cont.append(corners);
			$('.pirobox_up').append(piro_close);
			$('.pirobox_down').append(piro_nav);
			$('.pirobox_down').append(piro_play);
			piro_play.hide();
			$('.pirobox_down').append(piro_prev).append(piro_next);
			piro_nav.append(caption);
			var my_nav_w = piro_prev.width();
			main_cont.hide();
			var my_gall_classes = $("a[class^='pirobox']");
			var map = new Object();
				for (var i=0; i<my_gall_classes.length; i++) {
					var it=$(my_gall_classes[i])
					map['a.'+it.attr('class')]=0;
				}
			var gall_settings = new Array();
				for (var key in map) {
					gall_settings.push(key);
				}
				for (var i=0; i<gall_settings.length; i++) {
					$(gall_settings[i]).each(function(rel){this.rel = rel+1 + "&nbsp;of&nbsp;" + $(gall_settings[i]).length;});
						var add_first = $(gall_settings[i]+':first').addClass('first');
						var add_last = $(gall_settings[i]+':last').addClass('last');
				}						
			$(my_gall_classes).each(function(rev){this.rev = rev+0});
			var imgCache = $(my_gall_classes).each(function(){this.href});
			var hidden = $('body').append('<div id="imgCache" style="display:none"></div').children('#imgCache');
			$.each(imgCache, function (i,val) {
				$('<div/>').css({'background':'url('+val+')'/*,'width':'600px','height':'200px'*/}).appendTo(hidden);
			});
			var piro_gallery = $(my_gall_classes);
			$.fn.fixPNG = function() {
				return this.each(function () {
					var image = $(this).css('backgroundImage');
					if (image.match(/^url\(["']?(.*\.png)["']?\)$/i)) {
						image = RegExp.$1;
						$(this).css({
							'backgroundImage': 'none',
							'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=" + ($(this).css('backgroundRepeat') == 'no-repeat' ? 'crop' : 'scale') + ", src='" + image + "')"
						}).each(function () {
							var position = $(this).css('position');
							if (position != 'absolute' && position != 'relative')
								$(this).css('position', 'relative');
						});
					}
				});
			};
			$.browser.msie6 =($.browser.msie && /MSIE 6\.0/i.test(window.navigator.userAgent));
			if( $.browser.msie6 && !/MSIE 8\.0/i.test(window.navigator.userAgent)) {
				$('.t_l,.t_c,.t_r,.c_l,.c_r,.b_l,.b_c,.b_r,a.piro_next, a.piro_prev,a.piro_prev_out,a.piro_next_out,.c_c,.piro_close,a.play,a.stop').fixPNG();
				var ie_w_h =  $(document).height();
				bg_overlay.css('height',ie_w_h+ 'px'); 
			}
			if( $.browser.msie) {
			opt.close_speed = 0;
			}
			$(window).resize(function(){
				var new_w_bg = $(document).height();
				bg_overlay.css({'visibility':'visible','height':+ new_w_bg +'px'});				  
			});	
			piro_prev.add(piro_next).bind('click',function(c) {
				c.preventDefault();
				var image_count = parseInt($(piro_gallery).filter('.item').attr('rev'));
				var start = $(this).is('.piro_prev_out,.piro_prev') ? $(piro_gallery).eq(image_count - 1) : $(piro_gallery).eq(image_count + 1);
				if(!start.size()) {
					start = $(this).is('.piro_prev_out,.piro_prev') ? $(piro_gallery).eq($(piro_gallery).size() - 1) : $(piro_gallery).eq(0);
				}
				start.click();
				piro_close.add(caption).add(piro_next).add(piro_prev).css('visibility','hidden');
			});
			$(piro_gallery).each(function(array) {
					var item = $(this);
					item.unbind(); 
					item.bind('click',function(c) {
						c.preventDefault();
						piro_open(item.attr('href'));
						var this_url = item.attr('href');
						//var descr = item.children('span').html();
						var descr = item.attr('title');	
						var number = item.attr('rel');
						if( descr == ""){
						caption.html('<p>'+ this_url+'<em class="number">' + number + '</em><a href='+ this_url +' class="link_to" target="_blank" title="Open Image in a new window"></a></p>');
						}else{
						caption.html('<p>'+ descr+'<em class="number">' + number + '</em><a href='+ this_url +' class="link_to" target="_blank" title="Open Image in a new window"></a></p>');
						}
						if(item.is('.last')){
							$('.number').css('text-decoration','underline');
							
						}else{
							$('.number').css('text-decoration','none');
							}				
						if(item.is('.first')){
							piro_prev.hide();
							piro_next.show();		
						}else{
							piro_next.add(piro_prev).show();		  
						}
						if(item.is('.last')){
							piro_prev.show();
							piro_next.hide();
							piro_play.css('width','0');	  
						}else{
							piro_play.css('width','40px');
							}
						if(item.is('.last') && item.is('.first') ){
							piro_prev.add(piro_next).hide();
							$('.number').hide();
							piro_play.remove();
						}					
							$(piro_gallery).filter('.item').removeClass('item');
							item.addClass('item');
							$('.c_c').removeClass('unique');		
					});
				});
				var piro_open = function(my_url) {
					piro_play.add(piro_stop).hide();
					piro_close.add(caption).add(piro_next).add(piro_prev).css('visibility','hidden');
					if(main_cont.is(':visible')) {
						$('.c_c div').children().fadeOut(300, function() {
							$('.c_c div').children().remove();
							load_img(my_url);
						});
					} else {
						$('.c_c div').children().remove();
						main_cont.show();
						bg_overlay.fadeIn(300,function(){
						load_img(my_url);
						});
					}
				}
				var load_img = function(my_url) {
				if(main_cont.is('.loading')) {return;}
				main_cont.addClass('loading');
				var img = new Image();
				img.onerror = function (){
					var main_cont_h = $(main_cont).height();
					main_cont.css({marginTop : parseInt($(document).scrollTop())-(main_cont_h/1.9)});
				  $('.c_c div').append('<p class="err_mess">There seems to be an Error:&nbsp;<a href="#close" class="close_pirobox">Close Pirobox</a></p>');
					$('.close_pirobox').bind('click',function(c) {
						c.preventDefault();
						piro_close.add(bg_overlay).add(main_cont).add(caption).add(piro_next).add(piro_prev).hide(0,function(){ img.src = '';});
						main_cont.removeClass('loading');
					});
				}
				img.onload = function() {
					var imgH = img.height;
					var imgW = img.width;
					var main_cont_h = $(main_cont).height();
					var w_H = $(window).height();
					var w_W = $(window).width();
					$(img).height(imgH).width(imgW).hide();
						$('.c_c div').animate({height:imgH+'px',width:imgW+'px'},opt.my_speed);
						var fix = imgH/w_H*2.3;
						if(w_H < imgH){h_fix = fix;}else{h_fix = 2;}
						main_cont.animate({
						height : (imgH+40) + 'px' ,
						width : (imgW+40) + 'px' , 
						marginLeft : '-' +((imgW)/2+20) +'px',
						marginTop : parseInt($(document).scrollTop())-(imgH/h_fix)},opt.my_speed, function(){
						$('.piro_nav,.caption').css({width:(imgW)+'px','margin-bottom':'10px'});
						$('.piro_nav').css('margin-left','-'+(imgW)/2+'px');
							var caption_height = caption.height();
							$('.c_c div').append(img);					
							piro_close.css('display','block');
							piro_next.add(piro_prev).add(piro_close).css('visibility','visible');
							caption.css({'visibility':'visible','display':'block','opacity':'0.8','overflow':'hidden'});
							main_cont.hover(function(){
								caption.stop().fadeTo(200,0.8);},
								function(){caption.stop().fadeTo(200,0);
								});
								$(img).fadeIn(300);
									main_cont.removeClass('loading');
									if(opt.slideShow === true){
									   piro_play.add(piro_stop).show();
									}else{
										 piro_play.add(piro_stop).hide();
									}	
							});			
						}
					img.src = my_url;
					$('html').bind("keyup", function (c) {
						 if(c.keyCode == 27) {
							c.preventDefault();
							if($(img).is(':visible') || $('.c_c>div>p>a').is('.close_pirobox')){
								$(piro_gallery).removeClass('slideshow').removeClass('item');
								piro_close.add(bg_overlay).add(main_cont).add(caption).add(piro_next).add(piro_prev).hide(0,function(){ img.src = '';});
								main_cont.removeClass('loading');
								clearTimeout(timer);
								$(piro_gallery).children().removeAttr('class');
								$('.stop').remove();
								$('.c_c').append(piro_play);
								$('.sc_menu').css('display','none');
								$('ul.sc_menu li a').removeClass('img_active').css('opacity','0.4');	
								piro_next.add(piro_prev).show().css({'top':'50%'});	
								$(piro_gallery).children().fadeTo(100,1);
							}
						}
					});
					$('html').bind("keyup" ,function(e) {
						 if ($('.item').is('.first')){
						}else if(e.keyCode == 37){
						e.preventDefault();
							if($(img).is(':visible')){
								clearTimeout(timer);
								$(piro_gallery).children().removeAttr('class');
								$('.stop').remove();
								$('.c_c').append(piro_play);
								piro_prev.click();
							}
						 }
					});
					$('html').bind("keyup" ,function(z) {
						if ($('.item').is('.last')){
						}else if(z.keyCode == 39){
						z.preventDefault();
							if($(img).is(':visible')){
								clearTimeout(timer);
								$(piro_gallery).children().removeAttr('class');
								$('.stop').remove();
								$('.c_c').append(piro_play);
								piro_next.click();
								//alert('click')
							}
						}
					});
					var win_h = $(window).height();
					piro_stop.bind('click',function(x){
						x.preventDefault();
						clearTimeout(timer);
						$(piro_gallery).removeClass('slideshow');
						$('.stop').remove();
						$('.pirobox_down').append(piro_play);
						piro_next.add(piro_prev).css('width',my_nav_w+'px');
					});
					piro_play.bind('click',function(w){
						w.preventDefault();
						clearTimeout(timer);
						if($(img).is(':visible')){
						$(piro_gallery).addClass('slideshow');
						$('.play').remove();
						$('.pirobox_down').append(piro_stop);
						}
						piro_next.add(piro_prev).css({'width':'0px'});
						return slideshow();
					});
				  $(opt.close_all).bind('click',function(c) {
					$(piro_gallery).removeClass('slideshow');
					clearTimeout(timer);
					if($(img).is(':visible')){
						c.preventDefault();
						piro_close.add(bg_overlay).add(main_cont).add(caption).add(piro_next).add(piro_prev).hide(0,function(){ img.src = '';});
						main_cont.removeClass('loading');
						$(piro_gallery).removeClass('slideshow');
						piro_next.add(piro_prev).css('width',my_nav_w+'px').hide();
						$('.stop').remove();
						$('.pirobox_down').append(piro_play);
						piro_play.hide();
					}
				  });	
					if(opt.slideShow === true){
						function slideshow(){
							if( $(piro_gallery).filter('.item').is('.last')){
							clearTimeout(timer);
							$(piro_gallery).removeClass('slideshow');
							$('.stop').remove();
							$('.pirobox_down').append(piro_play);
							piro_next.add(piro_prev).css('width',my_nav_w+'px');								 
							} else if($(piro_gallery).is('.slideshow' ) && $(img).is(':visible')){
								clearTimeout(timer);
								piro_next.click();
							}
						}					
						var timer = setInterval(slideshow,opt.slideSpeed*1000 );
					}


				}
			}

		start_pirobox();
	}
})(jQuery);