imageResizer.js

jQuery(window).ready(slideshowResize);
jQuery(window).resize(slideshowResize);

//function to resize and center images and slideshow
function slideshowResize() {
    //SET CUSTOM VARIABLES
    //set ratio value  by dividing the images width by it height
    //* I usually round this to 2 decmials
    var imageRatio = "1.75";
    //set containerName equal to the div containing the image or slideshow function will use this div to set height and width so use 100% width or height for responsive demensions 
    var containerName = ".slideshow";
    //imageClass needs to specifcally target the actual image to center it properly in the container
    var imageClass = "li.slides img";

    //create variables equal to containers heigh and width
    var ssWidth = jQuery(containerName).width();
    var ssHeight = jQuery(containerName).height();

    // creates width and height based on ratio and round off decimals
    var nWidth = (ssHeight * imageRatio).toFixed(0);
    var nHeight = (ssWidth / imageRatio).toFixed(0);

    //set img height and width based on screen size and ratio
    if (nWidth < ssWidth) {
        var fnWidth = ssWidth;
        var fnHeight = nHeight;
    } else {
        var fnWidth = nWidth;
        var fnHeight = ssHeight;
    }

    //set images width and height
    jQuery(".jw-slideshow img.slideImage").width(fnWidth).height(fnHeight);

    // centers images horizontally and vertically
    jQuery(imageClass).css("left", -((fnWidth - ssWidth) / 2)).css("top", -((fnHeight - ssHeight) / 2));

    //MINIFIED FUNCTION
    //var imageRatio="1.75",containerName=".slideshow",imageClass="li.slides img",ssWidth=jQuery(containerName).width(),ssHeight=jQuery(containerName).height(),nWidth=(ssHeight*imageRatio).toFixed(0),nHeight=(ssWidth/imageRatio).toFixed(0);if(ssWidth>nWidth)var fnWidth=ssWidth,fnHeight=nHeight;else var fnWidth=nWidth,fnHeight=ssHeight;jQuery(".jw-slideshow img.slideImage").width(fnWidth).height(fnHeight),jQuery(imageClass).css("left",-((fnWidth-ssWidth)/2)).css("top",-((fnHeight-ssHeight)/2));

}