var xmlHttp

function showNum(str)
{
if (str.length==0)
  { 
  document.getElementById("newNum").value=""
  return
  }
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
  {
  alert ("Browser does not support HTTP Request")
  return
  } 
var url="/nNum.php"
url=url+"?a="+str
url=url+"&sid="+Math.random()
xmlHttp.onreadystatechange=stateChanged 
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
} 

function stateChanged() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 { 
 document.getElementById("newNum").value=xmlHttp.responseText ;
 } 
}
function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 // Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}

function newNums(oldNum)
{
	if (oldNum.length<5)
	{
		document.getElementById("newNum").value=oldNum;
	}
	else if(oldNum.length==5 && oldNum.substr(0,1)=='7')
	{
		document.getElementById("newNum").value='7'+oldNum;
	}
	else if(oldNum.length==6 && oldNum.substr(0,1)=='7' && oldNum.substr(1,1)!='7')
	{
		document.getElementById("newNum").value='7'+oldNum;
	}
	else if(oldNum.substr(0,1)=='1' && oldNum.length==6)
	{
		document.getElementById("newNum").value=' запрашиваем..';
		showNum(oldNum);
	}
	else {document.getElementById("newNum").value=oldNum;}
}