function getPageSize(){
        var xScroll, yScroll;
        var windowWidth, windowHeight;

        if (window.innerHeight && window.scrollMaxY) 
            {    
                xScroll = document.body.scrollWidth;
                yScroll = window.innerHeight + window.scrollMaxY;
            }
        else if (document.body.scrollHeight > document.body.offsetHeight)
            {     // all but Explorer Mac
                xScroll = document.body.scrollWidth;
                yScroll = document.body.scrollHeight;
            } 
        else 
            { 
                // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
                xScroll = document.body.offsetWidth;
                yScroll = document.body.offsetHeight;
            }
    
        if (self.innerHeight)
            {    // all except Explorer
                windowWidth = self.innerWidth;
                windowHeight = self.innerHeight;
            } 
        else if (document.documentElement && document.documentElement.clientHeight)
            { 
                // Explorer 6 Strict Mode
                windowWidth = document.documentElement.clientWidth;
                windowHeight = document.documentElement.clientHeight;
            } 
        else if (document.body)
            { 
                // other Explorers
                windowWidth = document.body.clientWidth;
                windowHeight = document.body.clientHeight;
            }    
    
        // for small pages with total height less then height of the viewport
        if (yScroll < windowHeight)
            {
                pageHeight = windowHeight;
            } 
        else 
            { 
                pageHeight = yScroll;
            }

        // for small pages with total width less then width of the viewport
        if(xScroll < windowWidth)
            {    
                pageWidth = windowWidth;
            } 
        else 
            {
                pageWidth = xScroll;
            }


        arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
        return arrayPageSize;
    }