// JavaScript Document
function winW(){
	if(window.innerWidth) return window.innerWidth;
	else if(document.documentElement && document.documentElement.clientWidth) return document.documentElement.clientWidth;
	else if(document.body && document.body.clientWidth) return document.body.clientWidth;
	else return null;
}
function winH(){
	if(window.innerHeight) return window.innerHeight;
	else if(document.documentElement && document.documentElement.clientHeight) return document.documentElement.clientHeight;
	else if(document.body && document.body.clientHeight) return document.body.clientHeight;
	else return null;
}
function changeScreen(){
	var w = winW();
	var h = winH();
	var scr = document.getElementById("screen");
	scr.style.height = h+"px";
	scr.style.width = w+"px";
} 
function loader(act){
	var q = "";
	switch(act){
		case "on":
			q = "block";
			changeScreen();
			break;
		case "off":q = "none";break;
	}
	document.getElementById('loader').style.display=q;
	document.getElementById('screen').style.display=q;
}