Center image in parent div

/*
params:
    image - DOM element
    div - parent div of image
    scaleMode - 'scale' or 'scaleCrop'
*/
function centerImageInDiv(image, div, scaleMode){
    $(image).css({
        width : "auto",
        height : "auto"
    });
    if (!scaleMode) scaleMode = "scaleCrop";
    var containerWidth = $(div).width();
    var containerHeight = $(div).height();

    var imgWidth = image.width;
    var imgHeight = image.height;

    var newWidth, newHeight;
    if ((containerWidth / containerHeight < imgWidth / imgHeight) ^ (scaleMode != "scale")) {
        newWidth = Math.min(containerWidth, imgWidth);
        newHeight = ((imgHeight * Math.min(containerWidth, imgWidth)) / imgWidth) >> 0;
    }
    else {
        newHeight = Math.min(containerHeight, imgHeight);
        newWidth = ((imgWidth * Math.min(containerHeight, imgHeight)) / imgHeight) >> 0;
    }

    $(image).css({
        width : newWidth + "px",
        height : newHeight + "px",
        "margin-left" : ((containerWidth - newWidth) >> 1) + "px",
        "margin-top" : ((containerHeight - newHeight) >> 1) + "px"
    });
}

// usage:
image.on('load', function(){
    centerImageInDiv(this, $(this).parent()[0], "scale");
});