function getPageSize() 
{
    var xScroll, yScroll;
    
    if (window.innerHeight && window.scrollMaxY) {	
    xScroll = window.innerWidth + window.scrollMaxX;
    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;
    }
    
    var windowWidth, windowHeight;
    
    if (self.innerHeight) {	// all except Explorer
    if(document.documentElement.clientWidth){
    	windowWidth = document.documentElement.clientWidth; 
    } else {
    	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 = xScroll;		
    } else {
    pageWidth = windowWidth;
    }
    
    return [pageWidth,pageHeight];
}            

function end()
{
    $('flyout_box').style.display = "none";
    new Effect.Fade($('overlay'), { duration: 0 });
}

function showOpac()
{
    $('flyout_box').style.display = "block";
    var arrayPageSize = getPageSize();
    $('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });
    new Effect.Appear($('overlay'), { duration: 0, from: 0.0, to: 0.7 });
    $('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
}