function validateForm() {
	var txtFileName = document.getElementById("txtFileName");
	
	var isValid = true;
	if (txtFileName.value === "") {
		isValid = false;
	}
	document.getElementById("btnSubmit").disabled = !isValid;

}


function sendRating(strURL)
{
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("ratemsg").innerHTML=xmlhttp.responseText;
    }
  }
xmlhttp.open("GET",strURL,true);
xmlhttp.send();
}