function popup(mypage, myname, w, h, scroll) {
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;

	win = window.open(mypage, myname, 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable=no,status=no')
	win.window.focus();
}

function show(id){
	var element = document.getElementById(id);
	if(element.style.display=='none'){
		element.style.display='block';
	}
	else{
		element.style.display='none';
	}
}

//posição da barra de rolagem
var scrolltoppar = 0;

function zoom(itemzoom){
	scrolltoppar = document.body.scrollTop; 
	var body = document.getElementsByTagName("body")[0];
    body.style.overflow = 'hidden';
	var zoomdiv = document.getElementById(itemzoom);
	zoomdiv.style.width = screen.width;
	zoomdiv.style.height = screen.height;
	zoomdiv.style.top = scrolltoppar;
	zoomdiv.style.display = "block";
}


function zoomexit(itemzoom){
	var body = document.getElementsByTagName("body")[0];  
	var zoomdiv = document.getElementById(itemzoom);
	zoomdiv.style.display = "none";	
	body.style.overflow = 'auto';
	body.scrollTop = scrolltoppar;
}