Microsoft JScript runtime error: Object doesn't support property or method 'addEventListener'

I am using visual studio 2008 with ie9 when i run may project i face this runtime error

Microsoft JScript runtime error: Object doesn't support property or method 'addEventListener'

but other browers running very well.

compelete error of this code is below,

var ver = getInternetExplorerVersion()

if( ver == 8.0 || ver == 7.0){

if (!document.body.addEventListener) {

window.attachEvent('onscroll', onscrollVideofunction)

window.attachEvent('onresize', onresizeVideofunction)

window.attachEvent('onbeforeunload', onbeforeunloadVideofunction)

}

}

else if(ver == 9.0) {

document.addEventListener('scroll', onscrollVideofunction, true)

document.addEventListener('resize', onresizeVideofunction, true)

document.addEventListener('beforeunload', onbeforeunloadVideofunction, true)

}

function getInternetExplorerVersion()

{

var rv = -1

if (navigator.appName == 'Microsoft Internet Explorer')

{

var ua = navigator.userAgent

if(window.MyObj)

var temp = window.MyObj.JavaScriptIEVersion(ua)

var re = new RegExp('MSIE ([0-9]{1,}[\.0-9]{0,})')

if (re.exec(ua) != null)

rv = parseFloat( RegExp.$1 )

}

return rv

}

function onbeforeunloadVideofunction()

{

var temp = window.MyObj.JavaScriptDisposeVideoPanel()

}

var KeepTimeout

function onscrollVideofunction(event)

{

window.MyObj.JavaScriptHideVideoPanel()

clearTimeout(KeepTimeout)

KeepTimeout = setTimeout('UpdateVideoPanel()', 200)

}

function UpdateVideoPanel()

{

var temp = window.MyObj.JavaScriptUpdateVideoPanel()

}

function onresizeVideofunction(event)

{

window.MyObj.JavaScriptHideVideoPanel()

clearTimeout(KeepTimeout)

KeepTimeout = setTimeout('UpdateVideoPanel()', 200)

}

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