JCrop: previous image not updated? - dom

Question

I developed a small JCrop file upload app; here is my code:
function createCropImage(event)
{
//alert(event.target.result);
document.getElementById("Imgpreview").src = event.target.result;
var img2 = document.getElementById("Imgpreview1").src = event.target.result;
// Create variables (in this scope) to hold the API and image size
var jcrop_api, boundx, boundy;
$('#Imgpreview1').Jcrop({
onChange: updatePreview,
onSelect: updatePreview,
aspectRatio: 1
},function(){
// Use the API to get the real image size
var bounds = this.getBounds();
boundx = bounds[0];
boundy = bounds[1];
// Store the API in the jcrop_api variable
jcrop_api = this;
});
function updatePreview(c)
{
$('#Xcoardinate').val( Math.round(c.x));
$('#Ycoardinate').val( Math.round(c.y));
$('#width').val( Math.round(c.w));
$('#height').val( Math.round(c.h));
if (parseInt(c.w) > 0)
{
var rx = 100 / c.w;
var ry = 100 / c.h;
$('#Imgpreview').css({
width: Math.round(rx * boundx) + 'px',
height: Math.round(ry * boundy) + 'px',
marginLeft: '-' + Math.round(rx * c.x) + 'px',
marginTop: '-' + Math.round(ry * c.y) + 'px'
});
}
};
}
Here Imgpreview is the preview image and Imgpreview1 is the source image. I first select an image through the browse button:
<input type="file" size="45" id="photoUploadElmt" name="upload" onchange="previewImg()" style="width:430px;"/>
The original image (Imgpreview1) and preview image (Imgpreview) are showing fine, but if I select another image, the preview image is correct but in place of Imgpreview1 I see the older image.
If I put following code in comments, then images are displayed properly but I lose the JCrop instance:
$('#Imgpreview1').Jcrop({
onChange: updatePreview,
onSelect: updatePreview,
aspectRatio: 1
},function(){
// Use the API to get the real image size
var bounds = this.getBounds();
boundx = bounds[0];
boundy = bounds[1];
// Store the API in the jcrop_api variable
jcrop_api = this;
});

Answer 1

The destroy method is unreliable, so create a custom one as in this similar question