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("Email address should be in the form of xyz@domainname")
     return false
  }
 
  if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
     alert("Email address should be in the form of xyz@domainname")
     return false
  }
 
  if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
      alert("Email address should be in the form of xyz@domainname")
      return false
  }
 
   if (str.indexOf(at,(lat+1))!=-1){
      alert("Email address should be in the form of xyz@domainname")
      return false
   }
 
   if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
      alert("Email address should be in the form of xyz@domainname")
      return false
   }
 
   if (str.indexOf(dot,(lat+2))==-1){
      alert("Email address should be in the form of xyz@domainname")
      return false
   }
  
   if (str.indexOf(" ")!=-1){
      alert("Email address should be in the form of xyz@domainname")
      return false
   }
 
    return true     
 }
 
function ValidateForm(){

 var f_name = document.getElementById("ContactUsFormFNameTxtBoxTextbox").value;
 if ((f_name==null)||(f_name=="")){
  alert("Please enter your first name");
  return false
 }
 
 var l_name = document.getElementById("ContactUsFormSNameTxtBoxTextbox").value;
 if ((l_name==null)||(l_name=="")){
  alert("Please enter your surname");
  return false
 }
 
 var emailID= document.getElementById("ContactUsFormEmailTxtBoxTextbox")
 //alert(emailID);
 if ((emailID.value==null)||(emailID.value=="")){
  alert("Please enter your email address")
  emailID.focus()
  return false
 }
 if (echeck(emailID.value)==false){
  emailID.value=""
  emailID.focus()
  return false
 }

var sel_op = document.getElementById("ContactUsFormEmailAddressListEmailList");
 var sel_val = sel_op.options[sel_op.selectedIndex].value;
 
 if (sel_val=='0'){
  alert("Please select a type of comment");
  return false
 }

 return true
 }