var httpRequest = null;
function getHTTPRequest()
{
    httpRequest = false;
    if(window.XMLHttpRequest) {
        // non-IE browsers
        try {
            httpRequest = new XMLHttpRequest();
        } catch(e) {
            httpRequest = false;
        }
    } else if(window.ActiveXObject) {
        // IE
        try {
            httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
        } catch(e) {
            try {
                httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
            } catch(e) {
                httpRequest = false;
            }
        }
    }
}

function rollover(image)
{
    if(image.disabled == true || image.src == "" || image.src.indexOf("_over.png") != -1)
        return;
    image.src = image.src.substring(0, image.src.length - 4) + '_over.png';
}

function rollout(image)
{
    if(image.disabled == true || image.src == "" || image.src.indexOf("_over.png") == -1)
        return;
    image.src = image.src.substr(0, image.src.length - 9) + '.png';
}