function

getViewportOffset(){

if(

window.

innerWidth){

return {

w:window.

innerWidth,

t:window.

innerHeight

}

}

else

if(

document.

compatMode ==

"BackCompat"){

return {

w:document.

body.

clientWidth,

t:document.

body.

clientHeight

}

}

else{

return {

w:document.

documentElement.

clientWidth,

t:document.

documentElement.

clientHeight

}

}

}