function setImage(setThisImage, toThisImage) {
    var setThis = document.getElementById(setThisImage);
    setThis.src = toThisImage.src;
}

function addEvent(obj, eventType, func, useCapture) {
    if (obj.addEventListener) {
        obj.addEventListener(eventType, func, useCapture);
        return true;
    } else if (obj.attachEvent) {
        return obj.attachEvent("on" + eventType, func);
    } else {
        alert("This website may not work properly in your browser.");
    }
}

function getPageSize() {
    var pageWidth = document.documentElement.clientWidth;

    var pageHeight;

    if (document.documentElement.scrollHeight) {
        // Firefox, Internet Explorer and Opera
        pageHeight = document.documentElement.scrollHeight;
    } else if (document.body.scrollHeight) {
        // Safari and Chrome
        pageHeight = document.body.scrollHeight;
    }

    return new Array(pageWidth, pageHeight);
}