// JavaScript Document

function login_1(){
 var inv = document.getElementById("login_1");
 var inv2 = document.getElementById("signin-bg_1");
 var w = document.body.clientWidth;
 var h = document.body.clientWidth;
 var w1 = parseInt(document.getElementById("signin-bg_1").style.width); 
 var h1 = parseInt(document.getElementById("signin-bg_1").style.height);
 var w_w1 = (w-w1)/2;
 var h_h1 = (h-h1)/2;

 document.getElementById("signin-bg_1").style.left = w_w1;

 inv.style.height= document.body.scrollHeight;
 inv.style.display=(inv.style.display=='none')?'block':'none';
 inv2.style.display=(inv2.style.display=='none')?'block':'none';
 document.body.style.overflow=(document.body.style.overflow=='hidden')?'scroll':'hidden';
}