function CheckExistance(TableName,FieldName,CheckValue,Msg,Method)
{
var xmlhttp;
var URL="CheckExistance.php?TableName="+TableName+"&FieldName="+FieldName+"&CheckValue="+CheckValue+"&Msg="+Msg;

if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else if (window.ActiveXObject)
  {
  // code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
else
  {
  alert("Your browser does not support XMLHTTP!");
  }


xmlhttp.onreadystatechange=function()
{
if(xmlhttp.readyState==4)
  {
  document.getElementById("CheckExistance").innerHTML=xmlhttp.responseText;
  }
  else
  	{
	 if(CheckValue != "")	
	 document.getElementById("CheckExistance").innerHTML="Checking Availability ...";
	}
}


xmlhttp.open(Method,URL,true);
xmlhttp.send(null);
}