function checkChar(sInput)
{
	for(var i = 0; i < sInput.length; i++)
	{
		if( !((sInput.charCodeAt(i) > 47 && sInput.charCodeAt(i) < 58 )||
		    (sInput.charCodeAt(i) > 64 && sInput.charCodeAt(i) < 91 )  ||
		    (sInput.charCodeAt(i) > 96 && sInput.charCodeAt(i) < 123 ))
		)
		{
			return false;
		}
	}
	
	return true;
}

function nchangeImg()
{
	var img = document.getElementById("imgVerify");
	img.src = "http://ptlogin2.qq.com/getimage?aid=10000101&" + Math.random();
	var ctrl = document.getElementById("code");
	if (ctrl != null)
	{
		ctrl.focus();
	}
}
function Process(xmlDoc)
{ 
    if( !xmlDoc )
      return     
  	var iRetCode = xmlDoc.getElementsByTagName("QQSHOW")[0].getAttribute("code");
  	var sText    = xmlDoc.getElementsByTagName("QQSHOW")[0].getAttribute("message") ;
  	var url      = xmlDoc.getElementsByTagName("QQSHOW")[0].text ;
  	if( iRetCode == 0 )
  	{
  	   alert(sText) ;
  	   top.location.href = url ;
    }
    else
    {
         nchangeImg() ;
         alert(sText) ;
       
    }
}