function GetPageSize() {
var scrW, scrH;
if(window.innerHeight && window.scrollMaxY)
{    // Mozilla   
scrW = window.innerWidth + window.scrollMaxX;   
scrH = window.innerHeight + window.scrollMaxY;
}
else if(document.body.scrollHeight > document.body.offsetHeight)
{    // all but IE Mac   
scrW = document.body.scrollWidth;   
scrH = document.body.scrollHeight;
} else if(document.body)
{ // IE Mac   
scrW = document.body.offsetWidth;   
scrH = document.body.offsetHeight;
}
var winW, winH;
if(window.innerHeight)
{ // all except IE   
winW = window.innerWidth;
winH = window.innerHeight;
} else if (document.documentElement && document.documentElement.clientHeight)
{    // IE 6 Strict Mode   
winW = document.documentElement.clientWidth;    
winH = document.documentElement.clientHeight;
} else if (document.body) { // other   
winW = document.body.clientWidth;   
winH = document.body.clientHeight;
}    // for small pages with total size less then the viewport
var pageW = (scrW