// JavaScript Document
function chgtop(){
     document.getElementById("header_top").className = "visibility_v";
	 document.getElementById("footer_top").className = "visibility_v";
}
function Re() {   
    document.getElementById('myId').style.height = 910+'px';
	document.getElementById('myId').style.width = 920+'px';
	document.getElementById('myId').style.top = 0+'px';
	document.getElementById('menu').style.visibility = 'hidden';
}
function Reout() {
	document.getElementById('myId').style.height = 0+'px';
	document.getElementById('myId').style.width = 0+'px';
	document.getElementById('myId').style.top = 0+'px';
	document.getElementById('myId').style.left = 0+'px';
}  
function menuV() {
	document.getElementById('menu').style.visibility = 'visible';
}