making whole divs fade in from black and white on mouseover?

making whole divs fade in from black and white on mouseover?

hello everyone,

i need some help please. 

On this page there are four columns of images. 

There is some jquery (which is commented out at the bottom of the html, see script below also) that coverts all images to black and white and when you hover they fade to colour, which is what i am trying to apply to these images. however when i do apply it it totally changed my css. how can I get this to work on this page?

$(".wrapper img").fadeIn(500);
$('.wrapper img').each(function(){
var el = $(this);
el.css({"position":"absolute"}).wrap("<div class='img_wrapper' style='display: inline-block'>").clone().addClass('img_grayscale').css({"position":"absolute","z-index":"998","opacity":"0"}).insertBefore(el).queue(function(){
var el = $(this);
this.src = grayscale(this.src);
$('.wrapper img').mouseover(function(){
$(this).parent().find('img:first').stop().animate({opacity:1}, 1000);
$(this).stop().animate({opacity:0}, 1000);
 function grayscale(src){
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
var imgObj = new Image();
imgObj.src = src;
canvas.width = imgObj.width;
canvas.height = imgObj.height; 
ctx.drawImage(imgObj, 0, 0); 
var imgPixels = ctx.getImageData(0, 0, canvas.width, canvas.height);
for(var y = 0; y < imgPixels.height; y++){
for(var x = 0; x < imgPixels.width; x++){
var i = (y * 4) * imgPixels.width + x * 4;
var avg = ([i] +[i + 1] +[i + 2]) / 3;[i] = avg;[i + 1] = avg;[i + 2] = avg;
ctx.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height);
return canvas.toDataURL();

Also is it possible to apply it to each column as a whole rather then the indiviual images, so the whole column (div) of imgs changes to color when mouse enters the div? 

Really would appreciate any help. Thanks