function showGuestBook(){
    var h= document.documentElement.scrollHeight;
    var w=document.documentElement.scrollWidth;
	document.all.MsgBoxBG.style.height=screen.availHeight-22;
	document.all.MsgBoxBG.style.width=screen.availWidth-22;
	document.all.MsgBoxBG.style.display='block';
	document.all.MsgBoxBG.style.top=0;
	document.all.MsgBoxBG.style.left=0;
	document.all.MsgBox.style.display='block';
	document.all.MsgBox.style.left=parseInt((w-532)/2);
	document.all.MsgBox.style.top=200;
}
function closebox(){
	document.all.MsgBoxBG.style.display="none";
	document.all.MsgBox.style.display="none";
}