function getHTTPObject()
{   
    if(window.XMLHttpRequest)
      {
          xmlhttp=new XMLHttpRequest();
      }
    else if(window.ActiveXObject)
      {
          try
        {
                xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch(e)
        {
            alert("your browser does n't support ajax");    
        }
      }
    return xmlhttp;
} 
 var xmlhttp = getHTTPObject();  
 
function Trim(s)
{
  while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r'))
  {
    s = s.substring(1,s.length);
  }
  while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r'))
  {
    s = s.substring(0,s.length-1);
  }
  return s;
}

function checkValidUser(val)
{        
    var vUrl="";
    var vUser="";
    var vPassword=""; 
    vUser=document.getElementById('vUsername').value;
    vPassword=document.getElementById('vPassword').value;
    if(vUser=="Email")
    {
     document.getElementById('login_errormsg').value="1"; 
     document.getElementById('frmlogin').action="index.php?file=m-login_a";  
     document.getElementById('frmlogin').submit();
    return false;
    }else{
    vUrl=SITEURL+'kmeda_ajax/validlogin.php?vUsername='+vUser+'&vPassword='+vPassword;
    var isWorking = false;
    if(!isWorking)
    {
                 
            xmlhttp.open("GET", vUrl , true);
            isWorking = true;
            xmlhttp.onreadystatechange = handleresponse_Checkvaliduser;
            xmlhttp.send(null);
    }
    }         
}
function handleresponse_Checkvaliduser()
{                  
    if(xmlhttp.readyState == 4)
    {                               
        isWorking = false;
        var valResponse_mem1="";
        valResponse_mem1 = xmlhttp.responseText; 
  if(Trim(valResponse_mem1)=="SUCCESS")
  {
     document.getElementById('frmlogin').action="index.php?file=m-login_a"; 
     document.getElementById('frmlogin').submit();
  }else{
     document.getElementById('login_errormsg').value="1"; 
     document.getElementById('frmlogin').action="index.php?file=m-login_a";  
     document.getElementById('frmlogin').submit();
  }  
}
}