Problemas com redimensionamento de Imagens via Jquery

Olá,

Estou tentando fazer com que várias imagens de uma página redimensionem de acordo com o tamanho da janela, porém não estou conseguindo muito bem.

O site já está no ar: http://www.gamarteemolduras.com.br/

As imagens também mudam quando passa o cursor por cima.

O jquery:

$(document).ready(function(){
$('#imagens ul li img').imgResize();

});

 

(function($) {

$.fn.extend({

	imgResize: function(options) {
 var defaults = {
 autoCenter: false, //future
 animate: false,
 speed: 1000,
 maxWidth: 10000, //future
 maxHeight: 10000, //future
 minWidth: 0, //future
 minHeight: 0 //future
 };

 var options = $.extend(defaults, options);

	return this.each(function() {
 var o = options;

 var obj = $(this);

 //get all images inside obj
 var items = $('img', obj);

 //this fixed safari issues with loading js before page load as opposed to just the resize(obj); declaration
 $(window).load(function() {
 resize(obj);
});

$(window).bind('resize', function() {
 resize(obj);

});//end window bind resize

//resize the image, based on windows width and height

 function resize(obj){
 var windowH = $(window).height();
 var windowW = $(window).width();
 var theImage = new Image();
 theImage.src = obj.attr("src");
 var imgwidth = theImage.width;
 var imgheight = theImage.height;

 if((imgwidth > windowW)||(imgheight > windowH)) {
 if(imgwidth > imgheight){
 var newwidth = windowW;
 var ratio = imgwidth / windowW;
 var newheight = imgheight / ratio;
 theImage.height = newheight;
 theImage.width= newwidth;
 if(newheight > windowH) {
 var newnewheight = windowH;
 var newratio = newheight/windowH;
 var newnewwidth =newwidth/newratio;
 theImage.width = newnewwidth;
 theImage.height= newnewheight;
 }
 }
 else{
 var newheight = windowH;
 var ratio = imgheight / windowH;
 var newwidth = imgwidth / ratio;
 theImage.height = newheight;
 theImage.width= newwidth;
 if(newwidth > windowW) {
 var newnewwidth = windowW;
 var newratio = newwidth/windowW;
 var newnewheight =newheight/newratio;
 theImage.height = newnewheight;
 theImage.width= newnewwidth;
 }
 }
 }
 if((o.animate == true)&&(!$.browser.msie))
 obj.stop(true).animate({
 'width':theImage.width+'px',
 'height':theImage.height+'px'
 },o.speed);
 else
 obj.css({
 'width':theImage.width+'px',
 'height':theImage.height+'px'
 });
 }

});//return this each /main code above this

}//plug in name end
}); //fn extend end
})(jQuery);//end ready

Quem puder ajudar, já agradeço :)

Ninguém??