function showLogin(){
document.getElementById("Full").style.display="block"; 
document.getElementById("alertUserLogin").style.display="block"; 
document.getElementById("alertUserLogin").style.left=(document.body.scrollWidth)/2-150;
document.getElementById("alertUserLogin").style.top=200;
document.getElementById("Full").style.width=document.body.clientWidth;
document.getElementById("Full").style.height=document.body.scrollHeight;
}