function GetHeight() {
    if (typeof window.innerHeight != 'undefined') {
        return window.innerHeight
    }
    else {
       return document.documentElement.clientHeight
    }
}

function GetWidth() {
    if (typeof window.innerWidth != 'undefined') {
        return window.innerWidth
    }
    else {
       return document.documentElement.clientWidth
    }
}

function GetPosition()
{
    if (typeof window.pageYOffset != 'undefined') { 
        return window.pageYOffset
    }
    else {
        return document.body.scrollTop
    }
}