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("Please enter a valid Email address");
  		return false;
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
  		alert("Please enter a valid Email address");
  		return false;
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
   		alert("Please enter a valid Email address");
   		return false;
	}

	if (str.indexOf(at,(lat+1))!=-1){
  		alert("Please enter a valid Email address");
  		return false;
	}

	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
  		alert("Please enter a valid Email address");
  		return false;
	}

	if (str.indexOf(dot,(lat+2))==-1){
  		alert("Please enter a valid Email address");
  		return false;
	}

	if (str.indexOf(" ")!=-1){
  		alert("Please enter a valid Email address");
  		return false;
	}
	return true;
}

function ValidateForm(){
	var emailID = document.forms['emailSubscriptionForm'].elements['email'];
	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;
	}
	return true;
}