function focusE(element) {
    $(element).focus();
    return false;
}
function center(element) {
    try {
        element = $(element);
    } catch (e) {
        return;
    }

    var my_width = 0;
    var my_height = 0;

    if (typeof (window.innerWidth) == 'number') {
        my_width = window.innerWidth;
        my_height = window.innerHeight;
    } else if (document.documentElement &&
             (document.documentElement.clientWidth ||
               document.documentElement.clientHeight)) {
        my_width = document.documentElement.clientWidth;
        my_height = document.documentElement.clientHeight;
    }
    else if (document.body &&
            (document.body.clientWidth || document.body.clientHeight)) {
        my_width = document.body.clientWidth;
        my_height = document.body.clientHeight;
    }

    element.style.position = 'absolute';
    element.style.zIndex = 99;

    var scrollY = 0;

    if (document.documentElement && document.documentElement.scrollTop) {
        scrollY = document.documentElement.scrollTop;
    } else if (document.body && document.body.scrollTop) {
        scrollY = document.body.scrollTop;
    } else if (window.pageYOffset) {
        scrollY = window.pageYOffset;
    } else if (window.scrollY) {
        scrollY = window.scrollY;
    }

    var elementDimensions = Element.getDimensions(element);

    var setX = (my_width - elementDimensions.width) / 2;
    var setY = (my_height - elementDimensions.height) / 2 + scrollY;

    setX = (setX < 0) ? 0 : setX;
    setY = (setY < 0) ? 0 : setY;

    element.style.left = setX + "px";
    element.style.top = setY + "px";

    element.style.display = 'block';
}

function showSignUp() {
    var div;
    var objName = 'divSignUpOverlay';

    //Browser check
    if (document.getElementById) {        
        div = document.getElementById(objName);
    }
    else if (document.all) {
        div = document.all[objName];
    }
    else {
        div = document.layers[objName];
    }

    div.style.display = 'block';        
    center('divSignUp');
    return false;
}
function hideSignUp() {
    var div;
    var objName = 'divSignUpOverlay';

    //Browser check
    if (document.getElementById) {
        div = document.getElementById(objName);
    }
    else if (document.all) {
        div = document.all[objName];
    }
    else {
        div = document.layers[objName];
    }

    div.style.display = 'none'; 
    return false;
}