Temporarily replace a css property of an element and restore that after fn is called.

tempCSS.js

function tempCSS(element, stylename, temp_value, fn){
    // Temporarily replace a css property and restore it after fn();
    var ret;
    var original_value = element.css(stylename);
    element.css(stylename, temp_value);
    ret = fn();
    element.css(stylename, original_value);
    return ret;
};