function getWindowSize(){
	var myWidth = 0, myHeight = 0;
		if( typeof( window.innerWidth ) == 'number' ) {
    	//Non-IE
    	myWidth = window.innerWidth;
    	myHeight = window.innerHeight;
	} else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    	//IE 6+ in 'standards compliant mode'
    	myWidth = document.documentElement.clientWidth;
    	myHeight = document.documentElement.clientHeight;
	} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    	//IE 4 compatible
    	myWidth = document.body.clientWidth;
    	myHeight = document.body.clientHeight;
  	}
  	
  	size = new Object();
  	size.width = myWidth;
  	size.height = myHeight;
  	return size;
  	//window.alert( 'Width = ' + myWidth );
  	//window.alert( 'Height = ' + myHeight );
  	//return new Array(myWidth, myHeight);
}

function checkWindowSize(){
	s = getWindowSize();
	if(s.height<768){
		showScrollbar();
	}else{
		hideScrollbar();
	}
}

function showScrollbar(){
	//b = $$('body')[0];
	document.body.style.overflow = 'auto';
}

function hideScrollbar(){
	//b = $$('body')[0];
	document.body.style.overflow = 'hidden';
}