<style type="text/css">

a.nowandthen{
position:relative;
display: block;
overflow:hidden;
cursor: pointer;
width: 300px; /* set width of image <style type="text/css">

a.nowandthen{
position:relative;
display: block;
overflow:hidden;
cursor: pointer;
width: 300px; /* set width of image container */
height: 501px; /* set height of image container */
}

a.nowandthen img{
position:absolute;
left:0;
top:0;
width: 100%;
height: 100%;
-moz-transition: all 0.5s ease; /* enable transition */
-webkit-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
-ms-transition: all 0.5s ease;
transition: all 0.5s ease;
z-index: 2;
clip: rect(0,300px,501px,0); /* clip values should be rect(0,image_width,image_height,0) */
}


a.nowandthen img:nth-of-type(2){ /* hide "after" image beneath "before" so it's initially out of view */
z-index: 1;
}


a.nowandthen:hover img:nth-of-type(1){ /* clip "before" image to reveal "after" */
clip: rect(0,0,501px,0); /* clip values should be rect(0,0,image_height,0) */
opacity: 0;
}

a.nowandthen.alt{
width: 300px; /* set width of image container */
height: 501px; /* set height of image container */
}

a.nowandthen.alt img{
clip: rect(0,300px,501px,0); /* clip values should be rect(0,image_width,image_height,0) */
}

a.nowandthen.alt:hover img:nth-of-type(1){
clip: rect(0,0,501px,0); /* clip values should be rect(0,0,image_height,0) */
}

</style>
