var xmlHttp

// -------------------------------------------------------------------
// Central AJAX Call
// -------------------------------------------------------------------
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;
}



// -------------------------------------------------------------------
// General Utilities
// -------------------------------------------------------------------  
// General trim of all white space in string
function trim_all(s)
{   
  var i;
  var returnString = "";
  // Search through string's characters one by one.
  // If character is not a whitespace, append to returnString.
  for (i = 0; i < s.length; i++)
  {   
      // Check that current character isn't whitespace.
      var c = s.charAt(i);
      if (c != " ") returnString += c;
  }
  return returnString;
}

// Specific trim of only whitespace (or specified char) at the end or beginning of a string.
// Parameters:
//   str:   string to trim (required).
//   chars: character to trim from string (optional. defaults to white space char). 
function trim(str, chars) {
	return ltrim(rtrim(str, chars), chars);
}

// Left trim only. 
function ltrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}

// Right trim only. 
function rtrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}

function hov(loc,cls) 
{ 
  if(loc.className) 
    loc.className=cls; 
} 

function isInt(x) 
{
  var y=parseInt(x);
  if (isNaN(y)) return false;
  return x==y && x.toString()==y.toString();
} 

function doClick(buttonName,e)
{
  //the purpose of this function is to allow the enter key to 
  //point to the correct button to click.
  var key;

  if (window.event)
  {
    key = window.event.keyCode;     //IE
  } 
  else 
  {
    key = e.which;     //firefox
  }

  if (key == 13)
  {
    //Get the button the user wants to have clicked
    var btn = document.getElementById(buttonName);
    if (btn != null)
    { //If we find the button click it

      btn.click();
      //e.keyCode = 0
      key = "";
    }
  }
}

function textCounter(field, countfield) 
{
  countfield.value = field.value.length;
} 
/*function textCounter(field, countfield, maxlimit) 
{
  if (field.value.length > maxlimit) // if too long...trim it!
      field.value = field.value.substring(0, maxlimit);
  // otherwise, update 'characters left' counter
  else 
     countfield.value = maxlimit - field.value.length;
} */

function checkform()
{
  // Ensure password has been specified. 
  var txt = document.getElementById("passwd");
  if (txt != null)
  {
     if (txt.value == null || txt.value == "")
     {
        alert("You must enter your xms gateway password.");
        return false;
     }
  } 
  
  // Ensure pager has been specified. 
  txt = document.getElementById("pagers");
  if (txt != null)
  {
     if (txt.value == null || txt.value == "")
     {
        alert("You must enter at least one pager/mobile number.");
        return false;
     }
  } 
  
  // Ensure message has been specifed. 
  txt = document.getElementById("idmsg");
  if (txt != null)
  {
     if (txt.value == null || txt.value == "")
     {
        alert("You must enter a message.");
        return false;
     }
  } 
  
  // Look for optional email address, and if present, ensure it's valid.
  txt = document.getElementById("email_reply");
  if (txt != null)
  {
     if (txt.value != null && txt.value != "")
     {
        if (echeck(txt.value)==false)
        {
          alert("The reply email is optional. But if entered, it must be a valid email address.");
          return false;
        }
     }
  }   
    
  return true;
}

function echeck(str) {

  var at="@"
  var dot="."
  var lat=str.indexOf(at)
  var lstr=str.length
  var ldot=str.indexOf(dot)
  if (str.indexOf(at)==-1){
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.indexOf(at,(lat+1))!=-1){
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.indexOf(dot,(lat+2))==-1){
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.indexOf(" ")!=-1){
    //alert("Invalid E-mail ID")
    return false
  }
  
  return true					
}