function proveraEmail(mail){
	var regID=window.document.getElementById("regID");	
if(regID.value!="0"){ //provera da li je u pitanju registracija ili login
	if (mail==0){
	  document.getElementById("mail_error").innerHTML="";
	  return;
	}
	if (window.XMLHttpRequest)
	  {// code for IE7+, Firefox, Chrome, Opera, Safari
	  xmlhttp=new XMLHttpRequest();
	  }
	else
	  {// code for IE6, IE5
	  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
	  }
	xmlhttp.onreadystatechange=function()
	  {
	  if (xmlhttp.readyState==4 && xmlhttp.status==200)
	    {
	    document.getElementById("mail_error").innerHTML=xmlhttp.responseText;
	    }
	  }
	xmlhttp.open("GET","proveraEmailAdrese.php?Email="+mail,true);
	xmlhttp.send();
}
}